A one year cross sectional study to assess the correlation amongst visual acuity, contrast sensitivity and visual field analysis in patients With glaucoma at kles dr. Prabhakar kore hospital and mrc, belagavi

Abstract

Purpose: To investigate the relationship between contrast sensitivity, high-contrast visual acuity, and visual field defects in glaucoma patients. Method: Patients with a diagnosis of glaucoma, glaucoma suspect, or ocular hypertension whose visual acuity on better were included in the study. Patients who meet the above criteria will be enrolled in the study after receiving approval from the institutional review board, and demographic data will be recorded in a predesigned proforma. Snellen's visual acuity chart will be used to determine the best corrected visual acuity. The Pelli Robson chart will be used to assess contrast sensitivity. The letters are arranged in groups of three, with consistent contrast within each group. Patients will be asked to identify the letters and will be required to continue until two or more errors are made in a group. The contrast threshold will be determined by the last group in which at least two of the three letters are correctly identified. Intraocular pressure is measured using Goldmann Applanation Tonometer. Visual field is analysed using Humphrey Field Analyzer. Normality of variable is checked by Shapiro Wilk test. Mann Whitney U test is used to compare the distributions of contrast sensitivity over field changes. Chi-square test is used to check the dependency between categorical variables. P-value less than or equal to 0.05 indicates statistical significance.