ABSTRACT
@#AIM:To investigate the monocular and binocular accommodative difference between wearing orthokeratology lens and frame lens in low myopic anisometropia children.<p>METHODS: Totally 47 children(94 eyes)with low degree myopic anisometropia(1.0D≤binocular equivalent spherical lens difference <2.5D)were involved between November 2019 and April 2020 in the retrospective clinical study. Twenty-seven cases(54 eyes)wore frame lens were used as group A and 20 cases(40 eyes)wore orthokeratology lens were used as group B. The corrected visual acuity and the accommodative parameters \〖the accommodative response(AR), the accommodative facility(AF), the accommodative amplitude(AMP)\〗 at 1mo after treatment were recorded and compared. <p>RESULTS:In two groups the results of AR were positive, and it meant accommodative lag(AL). AL of the higher myopic eyes was higher than the lower eyes in group A(0.63±0.21D <i>vs</i> 0.25±0.34D, <i>P</i><0.001), but there was no significant difference of AL in group B(<i>P</i>=0.104). Between two eyes, the difference of the corrected visual acuity and the monocular AMP in two groups were no significant(<i>P</i>>0.05). The binocular AR difference in group A was significantly higher than group B(0.38±0.36D <i>vs</i> 0.10±0.26D, <i>P</i>=0.005), and the binocular AF was lower(8.22±1.15c/min <i>vs</i> 9.95±0.89c/min, <i>P</i><0.001). There was no statistical difference in binocular AMP(<i>P</i>=0.280).<p>CONCLUSION: Low myopic anisometropia children with orthokeratology lens can obtain higher binocular AF and lower binocular AR difference than that with frame lens, so as to maintain more coordinated binocular accommodation.
ABSTRACT
@#AIM:To study the effect of orthokeratology on accommodation function in myopic children.<p>METHODS: This was a retrospective clinical study. The clinical data of myopia children in our hospital from September 2015 to December 2018, who wore orthokeratology contact lens(Ortho-k)or single vision lens(SVL)to control myopia were analyzed. 27 cases(54 eyes)with Ortho-k were all selected as the study group, the control group was matched from 108 cases(216 eyes)of the SVL group with the Propensity Score-matching(PSM)function of SPSS software. After matching, 27 cases treated with Ortho-k were compared to 27 cases treated with SVL. Accommodation function were assessed by accommodative amplitude(AA), accommodative sensitivity(AS), accommodative lag(LAG), negative relative accommodation(NRA), and positive relative accommodation(PRA)before and 1, 3, 6 and 12mo after treatment.<p>RESULTS: There was no statistical significance in the differences of the accommodative parameters between groups(all <i>P</i>>0.05); Wearing time had a significant effect on AA, AS, LAG, NRA and PRA of myopic children in two groups(FAA=4.7, FAS=5.6, FLAG=10.2,FNRA=7.06, FPRA=8.8, all <i>P</i><0.05). Meanwhile, there was an significant interaction effect on the accommodative parameters between wearing time and wearing types of the two groups(<i>F</i>AA=5.3, <i>F</i>AS=4.6, <i>F</i>LAG=11.4, <i>F</i>NRA=3.4, <i>F</i>PRA=11.1, all <i>P<</i>0.05).<p>CONCLUSION: Wearing orthokeratology can improve the accommodation function of myopic children, which may be one of the mechanisms by which they control myopia.