Effect of cataract extraction on retinal sensitivity measurements.

INTRODUCTION: Central and paracentral retinal function is often compromised in various retinal diseases. In these conditions, microperimetry is an important tool for assessing retinal sensitivity values. As retinal diseases are prevalent among the elderly, cataract often coexists. This study investigates the effect of cataract surgery on retinal sensitivity in patients with cataract without retinal disease. MATERIAL AND METHODS: A total of 30 patients already scheduled for cataract surgery microperimetry and visual acuity evaluation were enrolled before and after cataract extraction. The patients were allocated to one of three study groups in accordance with the main cataract subtype: nuclear, cortical, or subcapsular posterior cataract. RESULTS: Visual acuity increased significantly after cataract surgery (0.34 logMar to 0.00 logMar, p < 0.001, paired t-test). Similarly, median retinal sensitivity increased significantly from 23 dB (IQR 21-25 dB) to 27 dB (IQR 25.75-28 dB) (p < 0.001, Wilcoxon test). The increase of retinal sensitivity after cataract surgery was highest in the posterior subcapsular cataract group. CONCLUSION: The present study showed an increase in retinal sensitivity values after cataract removal, especially in the subcapsular posterior cataract group. Therefore, coexisting cataract must be considered when interpreting microperimetry results.