ABSTRACT
@#AIM: To evaluate the effectiveness of the Daytona ultra-widefield retinal imaging device in preoperative fundus examination before refractive surgery.<p>METHODS: A consecutive series of 624 eyes in 312 patients intended to performing refractive surgery with myopia were examined fundus by the Daytona ultra-widefield retinal imaging device before dilating pupil. After dilating pupil, the non-contact slit lamp lenses and three-mirror contact lens were used to examine fundus again.<p>RESULTS: Average examination time of the Daytona and non-contact slit lamp lenses was 5.38±1.25min and 7.25±3.23min respectively, there was no statistical significant difference(<i>P</i><0.001). The Daytona detected peripheral retinal pathology in 107 eyes(17.1%)and the non-contact slit lamp lenses detected peripheral retinal pathology in 108 eyes(17.3%), 126 lesions were detected and there was no statistical significant difference between the two methods(<i>P</i>=1.000).<p>CONCLUSION: The Daytona has non-contact, shorter time and ultra-widefield view of the retina which is a reliable method in examining the retinal pathology without mydriasis.
ABSTRACT
·AIM:To observe the effects of small incision lenticule extraction (SMILE) and trans-epithelial photorefractive keratectomy (Trans-PRK) on corneal horizontal coma, vertical coma, and spherical aberration and total higher order aberrations after refractive correction for myopia. ·METHODS: This was a prospective non-randomized cohort study. The cohort included 40 patients (80 eyes) with myopia, who received refraction correction surgery from December 2016 to February 2017 in Leshan Ophthalmic Center. Twenty patients (40 eyes) received SMILE surgery and the other 20 patients (40 eyes) received Trans-PRK surgery. Corneal aberrations were determined by a high-resolution Pentacam Scheimpflug camera before the surgery and at 1 and 3mo after the operation. Statistical analyses were performed using analysis of variance of repeated measures. · RESULTS: At 1 and 3mo post - operation, the uncorrected visual acuity in both groups was better than or equal to the preoperative best corrected visual acuity. The preoperative corneal aberrations showed no significant difference between the two groups (P>0.05). Significantly higher aberration was found after the surgery in both groups (P < 0. 05), however, no significant difference in higher aberration was found between 1 and 3mo post - operation (P > 0. 05). Post - operation, horizontal and vertical coma had no significant difference between the two groups (P>0.05), while SMILE group showed lower spherical aberration and lower total higher order aberration than Trans-PRK group (P<0.05). ·CONCLUSION: Both SMILE and Trans-PRK increase corneal aberration and their effects on horizontal and vertical coma are similar. However, SMILE has a minor influence on spherical aberration and total high order aberration than Trans-PRK.
ABSTRACT
AIM: To understand the epidemiology and related factors of strabismic amblyopia of students of primary school, and to provide guidances for the prevention and control strategy. METHODS: A total of 600 cases of primary school students of Leshan City, Jiajiang County were given vision, oblique incidence and ocular and other screening. The prevalence rate of poor eyesight of strabismus, amblyopia prevalence rate of different sexes, ages were compared, and the degree of amblyopia and strabismus of children with different types of amblyopia and whether or not had stereoscopic vision were counted. RESULTS: The prevalence rate of amblyopia and strabismus prevalence rate were respectively 4. 0% and 2.5%;With the growth of all age, low vision of students was significantly decreased, the difference of comparison of low vision rate of each age had statistical significance (P0. 05 );Ametropic amblyopia was the main type, accounting for 55. 6%, and the degree of amblyopia mainly was light, moderate; ametropic amblyopia, most of ametropic amblyopia and strabismus had stereo vision, but there were no stereopsis of most of the strabismic amblyopia and all esotropia. CONCLUSION:Ametropic is mainly type of amblyopia, the prevalence of relationship between the incidence of strabismic amblyopia of primary school students and sexes is not obvious, but the oblique amblyopia treatment effect, such as the establishment of stereoscopic vision and the age, eye position has a close relationship, should be early discovered, early treatment.