Partha Chowdhury

Effect of Ocular Deviation on Stereopsis

Purpose: The aim of the present study is to evaluate Stereopsis in the presence of ocular deviation Methods: A pilot, cross sectional, observational study was performed at tertiary eye care centers. Subjects with ocular deviation between 10 to 40 prism diopters, corrected distance Visual Acuity should be greater than 6/18 and Age should be between 10 to 40 years of age were included in the study. Stereopsis was evaluated using the Titmus Fly Test. Mean scores of visual parameters were taken. Results: A total of 30 subjects were included in the study. Of these 53% of subjects were in the age group of 11-20 years, 40 % subjects were in the age group of 21-30 years and 7% subjects were in the age group of 31-40 years. 60% subjects were Female. Stereopsis was deteriorated to 80 secs of arc in the presence of ocular deviation. Conclusions: In cases of ocular deviation, stereopsis deteriorates significantly.

Comparison of Visual Acuity in Different Types ofDeviation

Purpose: The aim of the present study is to compare the visual acuity in different types of deviation. Methods: A pilot, cross sectional, observational study was performed at tertiary eye care centers. Subjects with Ocular deviation between 10 to 40 prism diopters, Corrected distance Visual Acuity should be greater than 6/18 and Age should be between 10 to 40 years of age were included in the study. Visual Acuity was assessed with Log Mar chart. Result: 30 subjects were included in the study. Out of that,16 subjects were in the age group of 11-20 years, 12 subjects were in the age group of 21-30 years and 2 subjects were in the age group of 31-40 years. 60% subjects were Female and 40% subjects were Male. The mean visual acuity was considered in each type of deviation. It shows that visual acuity will be deteriorated more in Esotropia as compared to Exotropia Conclusion: Deterioration of visual acuity is observed more in Esotropia as compared to Exotropia.

Functional Vision with X Chrome Lenses

Purpose: To implement x chrome lens in children nMethods: A pilot, cross sectional study was performed in the tertiary eye centre during the period of 1 year. Functional vision like Visual Acuity, Contrast Sensitivity, Stereopsis and color vision of 10 existing x chrome soft contact lenses users were analyzed with and without lenses. nResults: Visual functions were compared statistically using paired t test with SPSS 20 software. Negligible change observed in visual acuity and contrast sensitivity with p value of 0.015 and 0.010 respectively. No change is observed in stereopsis. Ishihara shows normal color vision with x chrome lenses while D-15 test shows reduction in severity of color vision deficiency. nConclusions: If X chrome color contact lenses are implemented during child’s learning period, it will eliminate many of the academic challenges that are faced with color coded learning and teaching materials and improve their quality for many recreational activities.