Analysis of the dominant eye in the progress of myopia in adolescents / 国际眼科杂志(Guoji Yanke Zazhi)

@#AIM: To observe the characteristics of the dominant eye in the progression of myopia in the proportion and gender distribution of the left eye and the right eye in the dominant eye, the difference in the degree and growth rate of myopia between the dominant eye and the non-dominant eye during the progression of myopia in adolescents.<p>METHODS: In this prospective study, we selected 235 cases of 7-17 years old adolescents with myopia who were treated in our hospital from February to May 2020. The ocular structure was examined to exclude various eye diseases, and the dominant eye(card hole method)was determined and cycloplegic optometry was performed. They were all corrected by wearing monofocal glasses, and the dominant eye(card hole method)and cycloplegic optometry were retested after 1a.<p>RESULTS: Among the subjects, 159 cases were right eyes, accounting for 67.7%, and 76 cases were left eyes, accounting for 32.3%; There was no significant difference in gender distribution between dominant eyes and non-dominant eyes(<i>P</i>>0.05); There was no significant difference in spherical equivalent degree between dominant and non-dominant eyes(<i>P</i>>0.05); There was no significant difference in the degree of myopia growth between dominant and non-dominant eyes(<i>P</i>>0.05); There was no significant difference in the increase of myopia and the increase of myopia between the two eyes whether the right eye was dominant or the left eye was non-dominant(<i>P</i>>0.05); There was a significant correlation between the degree of myopia growth in the dominant eye and in both eyes(<i>P</i><0.01).<p>CONCLUSION: In myopic adolescents, most of the dominant eyes were right eye, and there was no difference between dominant eye and gender; Dominant eyes showed no specificity in the degree and growth of myopia, the dominant eye type do not affect the degree of myopia growth and the degree of anisometropia, but the degree of dominant myopia growth may affect the degree of anisometropia in both eyes.

Effect of dominant eye on balance function in age-related cataract patients / 国际眼科杂志(Guoji Yanke Zazhi)

@#AIM: To compare the effects of improving the dominant and non-dominant eye vision on the balance function of age-related cataract patients with a 3mo follow-up.<p>METHODS: Totally 106 patients with age-related cataract underwent monocular surgery were recruited. According to whether the surgical eyes were dominant, cases were divided into two groups: the dominant eye group(50 cases)and the non-dominant eyes(56 cases). Balance function(Berg balance scale, timed “up and go”)were tested 1d before surgery and 3mo after surgery.<p>RESULTS: The preoperative and postoperative Berg balance scale score changes were as followes: 50.08±4.92, 51.60±4.96, 1.52±1.14, in dominant eye group and 50.73±3.08, 51.67±2.65, 0.94±1.35 in the non-dominant eye group, there were no statistically differences in the first two items, and the amount of changes were statistically different(<i>P</i>=0.02). The preoperative and postoperative timed “up and go”were changed as these, 11.91±4.08s, 10.96±3.66s, 0.95±1.54s in dominant eye group, and 11.80±3.87s, 10.69±3.16s and 1.11±1.75s in non-dominant eye group, there were no statistically differences in the above three items(all <i>P</i>>0.05).<p>CONCLUSION: There was no effect on the balance function between the improvement of the visual acuity on dominant and the non-dominant eye in the age-related cataract with a 3mo follow-up.

The relationship between color vision discrimination ability and depth perception among university students / 国际眼科杂志(Guoji Yanke Zazhi)

Abstract? AIM: To evaluate the relationship between color discrimination ability ( CDA) and depth perception among university students with normal color vision.?METHODS:A total of 52 students, 33 males ( 63.46%) and 19 females (36.54%) from Baskent University Faculty of Medicine, aged 21.18 ±2.52y included in this study. Subject has normal visual acuity ( 20/20 ) and without congenital color vision deficiency ( CCVD ) . They were evaluated by Ishihara Pseudoisochromatic Plate Test (IPPT).Dominant eye (DE) was determined using the Gundogan Method. The CDA was examined by Farnsworth-Munsell 100 Hue Test ( FM100HT ) test for detecting total error score ( TES ) and local error score ( LES) for two eyes ( TE) open, the right eye ( RE) open and the left eye ( LE) open.The error scores were divided into the three groups: for the TE, for the dominant eye ( DE ) and for the non -dominant eye ( NDE ) . The presence of the binocularity and stereoscopic sensitivity ( SS ) were investigated by TNO test which were also divided into four groups according to the level of SS within a range of 480-15 arc/s.?RESULTS:The error scores of FM100HT without gender difference for TES, blue/yellow( b/y) LES and red/green (r/g) LES were found 61.22±30.32(58.50), 35.80±19.32 (36.50) and 25.42 ±14.65 (24.00) respectively.In male subjects (n=31) were found 67.45±29.95 (61.00), 40.25± 18.83 (39.00) and 27.19 ±14.30 (24.00) respectively.In female subjects (n=19) were found 51.05±28.84 (47.00), 25.52±18.32 (28.00) and 22.2±31.13 (23.00) respectively. Females had higher CDA than males according FM100HT error scores. CDA classification according to FM100HT were found to be higher ( 6%, TES=0-20 ) , medium (86%, TES=20-100), lower (8%, TES>100), the medium level was statistically more frequently observed (P<0.05). The r/g color LES for DE and NDE were 24.12±14.70 and 32.20±14.21, b/y color LES for DE and NDE were 34.68 ± 1.95 and 36.24±17.56 respectively.In female (n=19) r/g color LES for DE and NDE were 21.89 ±15.06 and 31.00 ± 22.42;in male (n=31) 25.48±14.55 and 32.93±17.31.In female (n=19) b/y color LES for DE and NDE were 29.63± 18.62 and 33.42±17.38; in male (n=31) 37.77±18.78 and 37.96±17.73 respectively.All students'TES of TE, DE and NDE subgroups and stereopsis level of were compared, the differences were not statistically significant ( P=1 ) . According to our research CDA and binocular depth perception does not effect on each other.?CONCLUSION: In normal subjects TES of FM100HT showed that no difference in the subject with different stereopsis level and the depth perception evaluated by TNO test which is based on color dissociation and the ability to color discrimination was not correlated. Our previous study DE's CDA was found superior to the NDE's.But in the presenting study showed that DE was not superior to NDE in terms of depth perception.

Effect of Dominant Eye and Contextual Background on Binocular Rivalry

PURPOSE: We investigated the effects of dominant eye and contextual background on predominance during binocular rivalry. METHODS: 10 subjects were recruited for the present study. Dominant eye was determined using the hole-in-the-card test. In experiment 1, subjects viewed the stimuli through anaglyph filters and reported the predominance of color. The subject's responses were compared with the color on the dominant eye. To investigate the influence of color dominance and contextual color, we conducted the experiment with added contextual color information target through switched-anaglyph filters. In experiment 2, the subject viewed the stimuli through the polarized filters and reported the predominance of orientation. The subject's responses were compared with the grating on dominant eye. To rule out the effect of stimulus size, we conducted the experiment with a smaller target. We designed the additional experiment to investigate the influence of contextual grating information on binocular rivalry. RESULTS: 10 subjects were evaluated. In experiment 1, 8 of 10 subjects reported that eye preference was highly correlated with dominant eye. This finding is significant without reference to color. In experiment 2, 7 of 10 subjects reported that eye preference was highly correlated with dominant eye. This finding is significant without reference to size. In experiment 1-2 and 2-2, all subjects reported that predominance of context contradictory target increased. CONCLUSIONS: We found the relationship between the dominant eye and eye preference. Experiment 1-2 and 2-2 showed that contradictory contextual information increases target predominance during binocular rivalry. Overall, our results indicate that the contextual background reduce the stimulus strength of the context-congruent target; it would correspond to an increase in the dominance duration of the context-contradictory target.

The Angle Kappa in Dominant and Non-Dominant Eye

PURPOSE: To evaluate differences between dominant and non-dominant eyes by analyzing angle kappa in dominant and non-dominant eyes. METHODS: Fifty-seven subjects who had best corrected visual acuity 20/20 in the better-seeing eye and no underlying ocular disease were recruited. Ocular dominance was determined using the hole-in-the-card test. Corneal topography, refractive error, intraocular pressure (IOP), and axial length were evaluated in both eyes. RESULTS: On corneal topography examination, the angle kappa and white-to-white measurements were significantly smaller in the dominant eye than the non-dominant eye (p = 0.013 and p = 0.045, respectively). However, no significant differences in sim K's' astigmatism (p = 0.210), central corneal thickness (p = 0.533), and anterior chamber depth (p = 0.216) were observed. In addition, cylindrical powers of the subjects measured by autorefraction (AR) were significantly lower in the dominant eye (p = 0.026); however no differences in spherical equivalent measured by AR (p = 0.061), IOP measured using pneumonic tonometer (p = 0.536), or axial length measured using laser biometry (p = 0.093) were observed. CONCLUSIONS: In this study, we found the angle kappa a new factor in determining the dominant and non-dominant eye. Difference in axial length and spherical equivalent between dominant and non-dominant eye may be associated with the difference in angle kappa.

Relationship of visual quality and postoperative dominant eye changes with age-related cataract / 国际眼科杂志(Guoji Yanke Zazhi)

? AlM: To investigate age - related cataract and its postoperative dominant eye changes and visual quality of patients. ?METHODS: Totally 102 patients ( 204 eyes ) with age-related cataract in our hospital from January 2013 to November 2014 were selected, and according to preoperative best corrected visual acuity ( BCVA ) were divided into two groups, in which the both eyes BCVA difference ≥2 lines ( 78 cases, 156 eyes ) was group A, and both eyes BCVA difference ≤1 line ( 24 cases, 48 eyes ) was group B. Dominant eyes were detected preoperatively and at postoperative 1 and 3mo. Contrast sensitivity and investigated visual satisfaction were tested. ?RESULTS: Preoperative dominant eye corrected visual acuity was 0. 34 ± 0. 11, significantly higher than that of the non-dominant eye (0. 15 ± 0. 09), and there was statistically significant difference ( P 0. 05 ); At postoperative 3mo, 17 cases in the group A had dominant eye changes, and change rate was 21. 79% (17/78). At postoperative 3mo, the dominant eye change rate in the group B was 20. 83% (5/24), and there was no statistical significant difference between the two groups ( P > 0. 05 ). The dominant eye change group and non- change groups patients with different spatial frequency contrast sensitivity test showed no statistical significance ( P >0. 05 ), Postoperative 3mo after operationvisual satisfaction questionnaire display, score of group A was (91. 35±10. 26) points, score of group B was (90. 15±9. 75) points (P>0. 05), the dominant eye change group score was (90. 08±9. 77) points, score non-change group was (91. 43±10. 22) points (P>0. 05). ?CONCLUSlON: The dominant eye changes exist in postoperative eyes with age-related cataract, but there is no effect on visual quality.

Study on the correlation between monocular mild myopic juvenile myopia degree and dominant eye / 国际眼科杂志(Guoji Yanke Zazhi)

?AlM: To study the correlation between monocular mild myopic juvenile myopia degree and dominant eye. ? METHODS: Totally 158 patients with juvenile monocularly mild myopia in our hospital from December 2012 to December 2013 were retrospectively analyzed, and cylindrical mirror astigmatism was used for spherical equivalent conversion. On the basis of the myopic degree, they were divided into three groups, 30 cases in group A (-0. 25~-0. 75D), 92 cases in B group (-1. 0~-2. 0D), 36 cases in group C (-2. 25 ~ -3. 0D). The card hole method was selected to measure dominant eye for subjectsat nearly 33cm and 5m. After glasses correction of ametropia, the far and near dominant eyes were received measurement again. ?RESULTS:The monocular mild myopia of dominant eye was compared with the non-dominant eye adjustment function, and there was no significant difference ( P>0. 05 ) . The dominant eye, non - dominant eye mean diopter and other correlations of eyes in the three groups were compared, and there was no significant difference (P>0. 05). The dominant eye of three groups at 5m was compared, and there was significant difference (P ?CONCLUSlON: The formation of myopic anisometropia is related to the degree of clearly seeing objects, although glasses correction can improve the clarity and visual, but affect the choice of the dominant eye, because the myopic anisometropia appears most early in the dominant eye, therefore optician correction stage, which should be taken into consideration, and avoid the severity of the adolescent myopia.

Relationship among Dominant Eye & Hand and Deviated Eye under General Anesthesia

PURPOSE: To evaluate the association between ocular dominance, hand dominance and eye deviation in orthophoric and strabismus patients under general anesthesia during surgery. METHODS: The subjects were divided into 2 groups. Group 1 was composed of 38 patients who underwent strabismus surgery and group 2 was composed of 107 patients who underwent non-strabismus surgery under general anesthesia. Best corrected visual acuity (BCVA), dominant hand and fixating eye were obtained before surgery, and ocular dominance was assessed using the hole-in-the-card test. Under general anesthesia, we took a digital photo of both eyes, and the deviating eye was determined. RESULTS: Under general anesthesia, the deviated eye showed no statistically significant correlation to the dominant eye and dominant hand in group I, respectively (p = 0.61, 0.74, respectively). In group II, there was no correlation between the deviated eye and the dominant eye (p = 0.65). The deviated eye also showed no correlation to the dominant hand in group II (p = 0.61). CONCLUSIONS: There was no correlation between the dominant and deviated eye under general anesthesia in the strabismus surgery group and the non-strabismus surgery group. Also, there was no correlation between the dominant hand and the deviated eye in patients under general anesthesia in the 2 groups.

Retinal Nerve Fiber Layer Thickness and Optic Disc Parameters in Dominant Compared with Non-Dominant Eyes

PURPOSE: To investigate the comparison of retinal nerve fiber layer (RNFL) thickness and optic disc parameters measured by optical coherence tomography (Cirrus HD-OCT(R)) in dominant and non-dominant eyes. METHODS: Seventy-one subjects without underlying ocular disease were recruited for the present study. Ocular dominance was determined using the hole-in-the-card test. Comprehensive standardized eye examinations were performed. Scans of the optic disc and RNFL were performed using OCT. RESULTS: The mean intraocular pressure (IOP) of the dominant eye was higher than its counterpart (p = 0.025). No significant differences were observed in uncorrected visual acuity, refractive error and axial length between dominant and non-dominant eyes (p = 0.235, 0.180, 0.850). No RNFL and optic disc features were identified in the dominant from non-dominant eyes. CONCLUSIONS: Although dominant eyes tended to have higher IOP than non-dominant eyes, no consistent ocular structural differences between dominant and non-dominant eyes with the use of OCT were found.

Clinical study on the association of ocular dominance with accommodation in myopia adult / 中华实验眼科杂志

Background Dominant eye is one of the functional asymmetric organ,and the dfference between dominant eye and undominant eye is a researching hotspot.But the study about accommodation in adult myopia is less.Objective This study was to determine the association between ocular dominances and accommodative factors in the subjects with adult myopia.Methods This study used prospective descriptive research method.Thirty-five subjects aged from 18 to 35 years with the myopia ranged from-2.00 D to-10.00 D and anisometropia less than 1.5 D,BCVA≥ 1.0 were recruited consecutively in this study.Ocular dominance was determined using the hole-inthe-card test and thumb test.Refractive error was measured with objective and subjective optometry,and amplitude of accommodation was measured by push-up test.Fusion cross cylinder(FCC) was used to measure the accommodative lag,and flipper test was applied to determine the accommodative facility.Oral informed consent was obtained from each subject before any relevant examination.Results No significant differences were found in the amplitude of accommodation (D),accommodative facility (cpm) and accommodative lag (D) between the dominant eye and undominant eye (accommodative amplitude:9.69 D±2.30 D vs.9.60 D±2.37 D,P =0.294 ;accommodative facility: 11.08 D±4.20 D vs.10.63 D± 4.60 D,P=0.260;accommodative lag:P=0.141).In the patients with the right eyes as dominance eyes,the accommodative amplitude of both eyes were (9.48±2.29) cpm and (9.33 ± 2.49) cpm,and accommodative facility were (10.50 ± 4.70) cpm and (9.99 ± 4.90) cpm.There were no significant differences between the right and left eyes in the accommodative amplitude,accommodative facility and accommodative lag (P =0.319,0.116,0.590).In the patients with the left eyes as dominant eyes,the accommodative amplitude of both eyes were (9.91±2.35)D and (9.88±2.26) D,and accommodative facility were (10.70±3.77)cpm and (11.25 ±4.27) cpm.No significant differences were seen between the right eyes and left eyes in the accommodative amplitude,accommodative facility and accommodative lag (P =0.749,0.295,0.238).Conclusions The amplitude of accommodation of the dominant eye is not significantly enhanced,and less accommodative lag and better accommodative facility also are found in the demonstrate eye in myopia adults with low anisometropia.

Correlation Analysis of Ocular Dominance and Levator Palpebrae Superioris Muscle Function

PURPOSE: Most of the bilateral structures in our body are not perfectly balanced, such that one side is preferred than the other or it has physiological superiority. Eyes also have an imbalance; the eye with sensory and motional superiority compared to the other is called dominant eye. Authors of this study focused on analyzing the correlation between the dominant eye and levator palpebrae superioris muscle. METHODS: The subject of this study was 42 patients with no ptosis and with no past history of blepharoplasty. Hand dominance was identified through questionnaire and dominant eye was identified by hole-in-the-card dominance test (Dolman's test) in all patients. The function of levator palpebrae superioris muscle was measured by MLD (marginal limbal distance). During the measuring procedure, frontalis muscle was not inhibited to avoid the eyelid skin hooding. RESULTS: Out of 42 patients, 27 patients(64.3%) were right ocular dominant, 15 patients(35.7%) were left ocular dominant, 36 patients(85.7%) were right hand dominant and 4 patients(9.5%) were left hand dominant. Out of 27 right ocular dominant patients, right MLD was larger than the left in 26 patients(96.3%). It was larger in average of 0.47mm(p<0.001) in 27 right ocular dominant patients. Also, left MLD was larger than the right in 11 patients (73.3%) out of 15 left ocular dominant patients. It was larger in average of 0.57mm(p=0.003) in 27 left ocular dominant patients. MLD on the side of the dominant eye was larger in average of 0.50mm(p<0.001) than the MLD of non-dominant eye side. Right MLD was larger than the left in average of 0.28mm(p=0.010) in right hand dominant patients, and left MLD was larger than the right in average of 1.15mm(p=0.025) in left hand dominant patients. CONCLUSION: The function of levator palpebrae muscle differs in right and left, and the difference correlates with the dominant eye. Also, the function of levator palpebrae muscle is stronger in the dominant eye. We were able to present statistical evidence regarding the difference of the function in right and left levator palpebrae muscle. This may be a factor worth consideration in terms of balancing the eyes during the blepharoplasty.

Decreased Visual Acuity of Dominant Eye Compared to Amblyopic Eye During Occlusion Therapy

PURPOSE: To investigate the clinical features of patients with decreased visual acuity (VA) of the dominant eye as compared to that of the amblyopic eye during occlusion therapy. METHODS: The authors analyzed clinical features of 28 patients with VA reversed between the two eyes during occlusion therapy among 500 patients treated with occlusion therapy under the diagnosis of monocular amblyopia. RESULTS: Twenty-one patients with strabismic amblyopia (SA), five patients with anisometropic amblyopia (AA) and two patients with combined amblyopia (CA) were enrolled in the present study. Decreased VA of the dominant eye as compared to that of the amblyopic eye occurred 66.75 +/- 83.63 weeks after the onset of occlusion therapy. Reversion of VA between both eyes occurred during amblyopia treatment in 17 patients and during maintenance therapy in 11 patients. The reversed VA was recovered in all patients. The mean duration (MD) of reversed VA was 15.00 +/- 24.43 weeks, and the number of clinic visits (CV) was 4.68 +/- 8.65. In five patients, the MD of reversed VA (59.80 +/- 30.14 weeks, p = 0.016) and the number of CVs (18.40 +/- 14.48, p < 0.001) were significantly longer than those of the other 23 patients (MD of reversed VA: 5.78 +/- 4.04 weeks, number of CV: 1.70 +/- 1.22); those five patients had low compliances and SAs. CONCLUSIONS: Visual acuity was recovered in all patients with decreased VA of the dominant eye as compared to that of the amblyopic eye during occlusion therapy, rapid recovery was observed in most patients except in several patients with low compliance.

The Refractive Errors of Dominant and Non-dominant Eyes

PURPOSE: To evaluate differences between dominant and non-dominant eyes through analyzing refractive factors in determination of the dominant eye. METHODS: Sixty-two subjects without underlying ocular disease were recruited. Ocular dominance was determined using the hole-in-the-card test. Uncorrected visual acuity, refractive error, and intraocular pressure (IOP) were checked in both eyes. RESULTS: Mean uncorrected visual acuity of the dominant and non-dominant eye were 0.41 and 0.39, respectively. The number of patients whose uncorrected visual acuity of the dominant eye was superior to the non-dominant eye was 18(29%), and inferior to the non-dominant eye was 18(29%). Mean refractive power in the dominant eye was -3.2 diopter and -3.43 diopter degrees in the non-dominant eye, therefore no difference in degrees of myopia between the groups (P=0.282) was observed. The number of patients whose dominant eye had a greater degree of myopia than the non-dominant eye was 24(39%) and the patients with a lower degree of myopia in the dominant eye was 32(52%). Astigmatism of the dominant eye was lower than the non-dominant eye in 35(56%) of the patients, thus a significant relationship was shown between astigmatism and the dominant eye (P=0.0014). The mean IOP of the dominant eye was 15.4 mmHg and the non-dominant eye was 15.7 mmHg, showing no significant difference between eyes. CONCLUSIONS: The dominant eye showed a lower degree of astigmatism than the non-dominant eye. The previous belief that myopia is more progressed in the dominant eye than the non-dominant eye because of excessive accommodative use of the dominant eye requires further study.

A study on surgical management of 17 patients with consecutive strabismus in hyderabad / 国际眼科杂志(Guoji Yanke Zazhi)

AIM: To determine the clinical course and management of patients undergoing surgery for consecutive strabismus.METHODS: Patients less than 45 years of age presenting with consecutive strabismus were divided into two groups (1-Esodeviation and 2-Exodeviation). Angle of deviation was measured in prism diopter (PD). Conservative therapy was experienced during the course of follow-up after first surgery. All the subjects with deviation of more than 15PD after six months of follow-up were selected for repeat surgery. Compulsory investigations were performed. Secondary surgical procedures were performed under general anesthesia. Postoperative follow-up was done at 3 days, 15 days, 3 months and 6 months.RESULTS: Subjects(28.8%)developed consecutive stra-bismus within the study period. Second surgery on a dominant (fixating) eye in all patients was performed within 6 to 9 months after first surgery. After second surgical interven-tion, good surgical outcome was obtained and the tendency towards over correction was not observed in both groups during follow-up period.CONCLUSION: There is a need for guarded muscle correction during second surgery to avoid over corrections in future.

Effect of Laser in situ Keratomileusis on Accommodation / 华中科技大学学报（医学）（英德文版）

Summary: The accommodative function before and after laser in situ keratomileusis (LASIK) was observed, and the effect of LAS IK on accommodation was investigated. In a prospective clinical trial,48 myopic patients (96 eyes) subject to bilateral LASIK in Refractive Surgery Center, Tongji Hospital, Tongii Medical College, Huazhong University of Science and Technology (China) from March 2006 to June 2006 were selected and studied. Refractions, accommodative range, amplitude of accommodative response and high frequency component (HFC) of accommodative microfluctuations were measured with NEDIK-730A before and one week and 30 days after operation. Dominant and non-dominant eyes were determined by hole-in-card method. It was found that all of the operative eyes showed an uncorrected visual acuity of 0.8 or better one week postoperatively, and 1.0 or better 30 days postoperatively. Compared with those preoperatively, accommodative range and HFC had no significant difference at first week and 30th day after operation in both dominant eyes and non-dominant eyes (P0.05), but there was a significant difference in the amplitude of accommodative response/accommodative stimulus ratio (A/S) after operation (P<0.01), and no significant difference was found in' accommodation between one week and 30 days postoperation. No ocular dominance's change was noted. There was no significant difference in accommodative function between dominant eyes and non-dominant eyes. It was suggested that LASIK produced no significant effect on accommodation.

A study on dominant eye measurement / 国际眼科杂志(Guoji Yanke Zazhi)

AIM: To examine a new performance test for detecting eye dominance by testing and re-testing with two different methods of the same subjects for comparing and discussing the reliabilities of these tests. ·METHODS: A total of 179 university students (mean age±SD was 19.37±1.62 years) were voluntarily participate in this survey consisting of 110 females (61.5%) and 69 males (38.5%). Eye dominances were determined by two different methods which were named McManus examined using a test-retest method. ·RESULTS: Without sex difference right eyes were found dominant for 128 (71.5%) participants by McManus test. The right eye dominance were found for 110 (61.5%) subjects. The results of these two methods were related significantly by Fisher Exact test (P ＜ 0.01), with an agreement scores (κ=0.256, P＜ 0.001). In females the right eye dominance were found for 74 (67.3%) and left eye were found for 36 (32.7%) by McManus test. When the right eye dominance was found as 62 (56.4%); and the left eye dominance was found for 48 (43.6%) females were related significantly by Fisher Exact test (P＜ 0.05), with a weak agreement scores (κ=0.239, P ＜ 0.01). In males the right/left eye dominance were found respectively 54 (78.3%), 15(21.7%) in McManus test as it was found as 48 (69.6%), 21 (30.4%) for the same test and Fisher exact test were used for the analysis of categorical data. The agreement between different methods was analyzed with Kappa statistics. Comparison of proportions was made by two proportions z test. P value less than 0.05 was considered as significant. ·CONCLUSION: Without gender difference and also in both females and males marked right eye dominance was observed. The right eye dominance was considering functional laterality may due to the dominance of left hemisphere instead of right hemisphere. It is an important topic future research in laterality, and it may well become an important model system for future research.

Ocular Dominance Determined by Near Point of Convergence Test in Intermittent Exotropia

This study was designed to validate the usefulness of the near point of convergence(NPC)test in determination of dominant & non-domnant eyes in intermittent exotropia patients. We performed NPC test in 36 intermittent exotrpic patients, and then, determined the non-dominant eye which deviated outward beyond the NPC. The dominant eyes determined by the NPC were compared to those that were determined by amblyopia, sensory fusion and photophobia. Best corrected visual acuity was used to divide patients into two groups : 26 patients without amblyopia, and 10 with amblyopia. Among the amblyopia group, if the eyes with better visual acuity were taken as dominant eyes, then eight(80%)cases were identical with the NPC test and two(20%)cases were different. Ten patients had sensory anomaly, and among then, nine(90%)cases were identical with the NPC test and one(10%)case was different. Twenty six(64%)patients had photophobia in one eye and all(100%)cases were identical with the NPC test. In intermittent exotropia, determination of dominant eye by the NPC test showed high coincidence with other tests. Therefore, we suggest that the NPC test is an easy and accurate method in determining either the dominant or non-dominant eye for surgery.

The Surgical Results of Medial Rectus Muscle Resection of Dominant Eye and Lateral Rectus Muscle Recession of Non-dominant Eye in Intermittent Exotropia

Intermittent Exotropia has been treated by various surgical methods such as bilateral medial rectus resection, lateral rectus recession and medial rectus resection of deviating eye, and bilateral lateral rectus recession. However, the outcomes of such operations are unsatisfactory because of high incidence of postoperative undercorrection and overcorrection. Authors have performed a surgical method which is the medial rectus muscle resection of dominant eye and lateral rectus muscle recession of non-dominant eye in 68 patients. Authors considered the outcome successful if patients achieve deviation between 10 PD of exophoria and 5 PD of esophoria, good stereopsis, no suppression and no manifest deviation. The success rate was 83.8% (57/68) and there was no overcorrection over 6 months follow-up. As postoperative complications, 5 cases of temporary turning of face and 3 cases of asymmetric palpebral fissure were seen. Therefore, these results suggest that medial rectus resection of dominant eye and lateral rectus recession of non-dominant eye in intermittent exotropia may be an alternative surgical method for intermittent exotropia. However, further studies are necessary to determine the exact surgical amounts and mechanism of this surgical method.

The Relationship of Dominant Eye, Dominant Hand, and Deviated Eye in Strabismus

We studied the relationship of deviated eye with dominant eye, dominant hand and visual acuity in 109 horizontal strabismic patients. Control group of 109 normal subjects without strabismus or specific ocular diseases were also examined. Right ocular dominance in normal subjects was noted in 66.1%. Strabismic patients showed ocular dominance of nondeviated eye in 78.5%. The dominance of right hand in normal subjects were noted in 89.0% and those were 82.6% in strabismic patients. Better visual acuity of right eye were noted in 40.4% of normal subjects, and 28.4% in left eye. Equal visual acuity between two eyes were 31.2% of the subjects. Strabismic patients showed better visual acuity in 70.9% of nondevia ted eye. Based on these results, the correlation of nondeviated eye with dominant eye, and better visual acuity were statistically significant(p0.05).