Comparison of Contrast Sensitivity with ACV (Visual Capacity Analyzer) in Different Types of Posterior Capsular Opacification

Kim, Hyun Jin; Kim, Hyojin; Cho, So Hyun; Cho, Beom Jin; Choi, Ki Yong; Chung, Kyu Hyung; Joo, Choun Ki

Abstract

PURPOSE
To compare contrast sensitivity (CS) in type and degree of posterior capsule opacification (PCO) in pseudophakic eyes before and after neodymium: YAG capsulotomy. METHODS: Nine eyes with fibrosis-type PCO and 26 with Elschnig-pearl type PCO were examined for best corrected visual acuity (BCVA) and CS before and 1 week after capsulotomy. CS was tested with visual capacity analyzer (ACV) which uses a Landolt ring of 5 different spatial frequencies (SF) under two different conditions of day (100cd/m2) and night (30cd/m2). The patients were divided into two groups based on the BCVA before capsulotomy: Group A, 4 eyes and 18 eyes with below 0.63 in fibrosis-type and pearls-type PCO, respectively; Group B, 5 eyes and 8 eyes with above 0.63 in fibrosis-type and pearls-type PCO, respectively. RESULTS: The patients with PCO had worse BCVA and CS, but these were improved by Nd: YAG capsulotomy. This was not affected by the types and degrees of PCO. In the daytime condition, CS of B group was worse at all SF in patients with pearl-type PCO than in those with fibrosis-type PCO before capsulotomy, except 19 cpd (p<0.05). In the nighttime condition, CS in the two groups showed no difference at all SF (p>0.05). CONCLUSIONS: In the daytime condition, the patients with pearls-type PCO of relatively poor BCVA had lower CS than those with fibrosis-type PCO.