Comparison of filter lenses versus non filter lens on stereoacuity in high myopic patients

Abstract

Objective: To determine whether filter lenses improve stereoacuity in high myopic patients compared to non-filter lens.

Methodology: It was Comparative Cross-Sectional Study conductedaahis from December 2023 to March 2024 in Asif Eye Clinic, Lahore. The study involved 66 high myopic patients (40 males and 26 females), aged between 18 and 60 years, with myopia ranging from -6.00D to -10.00D. Stereoacuity was measured using the TNO test, which evaluates depth perception through a series of random dot stereograms. Each patient's stereoacuity was first measured without any filter lenses to establish a baseline. Subsequent assessments were conducted with red, green, blue, and yellow filter lenses. The differences in stereoacuity with each filter were statistically analyzed using repeated measures ANOVA and paired t-test to determine the significance of any improvements.

Results: The results indicated a significant improvement in stereoacuity with blue filters (p-value = 0.001). Yellow filters also showed slight improvement in stereoacuity (p-value = 0.04). Red and green filters did not show statistically significant improvements in stereoacuity compared to the non-filter baseline.

Conclusion: The findings of this study suggest that the use of filter lenses, particularly blue filter lenses, can enhance stereoacuity in high myopic patients. This could have implications for improving visual performance in this population. Further research is recommended to explore the underlying mechanisms and to confirm these results in larger and more diverse patient groups.

Keywords: High myopia, stereoacuity, filter lenses, TNO test, visual enhancement, blue filter, yellow filter.