The Influence of HEV-Filtering Contact Lenses on Behavioral Indices of Glare. Issue 12 (6th December 2022)

• Record Type: Journal Article
• Authors: Renzi-Hammond, Lisa M.; Buch, John; Xu, Jie; Hammond, Billy R.
• Is Part Of: Eye & contact lens. Volume 48:Issue 12(2022)
• Page Start: 509
• Page End: 515
• Publication Date: 2022-12-06
• Subjects: Positive dysphotopsia -- HEV-filter -- Contact lenses; Contact lenses -- Periodicals; Intraocular lenses -- Periodicals; Orthokeratology -- Periodicals; Anterior segment (Eye) -- Diseases -- Periodicals; 617.7523
• DOI: 10.1097/ICL.0000000000000944
• Languages: English
• ISSNs: 1542-2321

Abstract

Abstract : Objectives: We assessed the effects of a HEV-filtering contact lens on positive dysphotopsia (halos and starbursts) and a behavioral index of scatter measured using two-point light thresholds. These effects were assessed by direct comparison to a clear (i.e., non-HEV filtering) contact lens tested in the fellow eye. Methods: Sixty-one subjects were randomized and fit with study lenses and 58 subjects completed the study. A double-masked contralateral design was used. Subjects were randomized to test lens-OD, control lens-OS, or vice versa. Participants were exposed to a point source of broadband simulated sunlight (a 403-nm condition was also tested) that created the appearance of halos/starbursts. The degree of dysphotopsia was measured as the diameter of broadband and violet-induced halos, and broadband light-induced starbursts. Two-point thresholds were assessed as the minimum resolvable distance between two pinpoints of light. Results: The HEV-filtering lens was statistically superior ( P <0.0001) to the clear lens in all the conditions tested. The HEV-filtering lens significantly reduced halo diameter by 30%, starburst diameter by 23%, and resolvable distance in the two-point condition by 18% (white) and 30% (violet). Conclusions: HEV-filtering contact lenses can reduce some deleterious effects of bright broadband light by decreasing light scatter, halos, and starbursts.