AN ANALYTICAL STUDY OF BLINK RATE EFFECT ON OPTICAL PERFORMANCE DYNAMICS

Abstract

This work aimed to examine the optical quality of tear films(TFs) for four sorts of the silicon hydrogelic contact lens type (SHCL) for everyday wearing for 15 days for various blink rates (BRs). The selected contact lenses in this work involvedlotrafilcon B, samfilcon A, comfilcon A, and filcom V3 brands. Serial estimations of the Objective Scatter Index (OSI) utilizing the HD Analyzer were taken at the distinctive blinking pattern: blinks each 2.5 sec (higher rates) and each 9 sec (lower rates). They were carried out within the firstly visiting before inserting the contact lens, after 20 min of wearing on the 1^st-day, and after 8 h of wearing on the 15^th-day. Healthy young’s eyes were fitted with the mentioned lenses. In case of low BRs, all of the contact lenses mean OSI values and slopes were increased over the time, wile the contact lens D showed an opposite trend. When contact lenses B and C were used, the mean OSI increased and the slope remained constant. Dynamically the visual quality of the TF after wearing the selected lenses for 15 days showed a slight deterioration at lowest BRs levels.