INITIAL COMFORT AND SURFACE WETTABILITY: A COMPARISON BETWEEN DIFFERENT CONTACT LENS MATERIALS

Title INITIAL COMFORT AND SURFACE WETTABILITY: A COMPARISON BETWEEN DIFFERENT CONTACT LENS MATERIALS
Author, Co-Author Bruce Morgan, Robert Hatfield, Douglas Jordan, Vinita Henry, Edward Bennett, John Marohn
Topic
Year
1992
Day
Monday
Program Number
Poster 8
Room
Great Hall
Affiliation
Abstract The purpose of this study was to compare the initial comfort and surface wettability of the NOVALENS to both the ENVISION biaspheric lens design and a hydrogel material (D3X4, Wesley-Jessen). This study consisted of 15 non-contact lens wearers. Both subjective comfort and objective wettability were evaluated at 5, 15, and 60 minutes after insertion of the lens. The other eye wear used as a non-wearing control. The initial comfort was evaluated on a 5 to 1 scale with 5 equaling no lens awareness and 1 equaling intolerable. Surface wettability was evaluated via biomicroscopy at each time interval and also rated on a 5 to 1 scale with 5 being a regular and smooth tear film with no break-up between blinks and 1 being total non-wetting of the lens surface. No two lens materials were fitted within a 24 hour period. The rigid diagnostic lens was selected using the manufacturer's fitting guide for both the NOVALENS and ENVISION designs. The D3X4 8.6 base curve radius was selected for average keratometry (K) readings between 41-45 D; 8.3 was used for K readings above 45 D and 9.0 was used for K readings below 41 D. All lenses were - 3.00 D in power. Results of this study show that the initial comfort was significantly better with the D3X4 lens; no significant difference was found between the 2 rigid lens materials. No significant difference in lens surface wettability was found between the 3 materials. The results parallel findings of previous studies, however, they contradict NOVALENS manufacturer's claim pertaining to initial comfort. As no significant difference in wettability between lens materials was found in this study, perceptions that the short-term wettability of any one of these lens materials is superior to the other materials investigated seems unfounded.
Affiliation of Co-Authors
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