Spectral Transmittance of Soft Contact Lenses Following One Month of Eyedrop Application: An In Vitro Investigation
- Author:
Haliza Abdul Mutalib
1
;
Bashirah Ishak
;
Mohd Norhafizun Mohd Saman
Author Information
- Publication Type:Journal Article
- Keywords: Spectral transmittance, contact lenses, ophthalmic solutions, ISO, Eyedrop.
- From: International e-Journal of Science, Medicine and Education 2025;19(2):18-27
- CountryMalaysia
- Language:English
- Abstract: Spectral Transmittance of Soft Contact Lenses Following One Month of Eyedrop Application: An In Vitro Investigation:This study investigated the spectral transmittance of six different types of soft contact lenses after exposure to normal eyedrops use over one month. The normal eyedrops were only meant to be instil into the eyes without contact lenses. The objective of this lab study was to look at the effect of the eyedrops on the spectral transmittance of all contact lenses. The two types of eyedrops for dry eye (eyedrop A) and eye irritation (eyedrop B) were applied to the surface of each contact lens (two drops each) at 2-hour intervals (n = 15), following which the lenses were immediately immersed in saline solution. This process was repeated four times daily (eight hours for Eyedrop A) and five times daily (10 hours for Eyedrops B), with the lenses subsequently soaked in Optifree disinfecting solution overnight. This constituted one complete cycle, which was repeated daily for 30 consecutive days. The control group underwent a similar procedure but used a saline solution instead of a disinfecting solution. Spectral transmittance measurements were conducted on Day 0 and Day 30 for both the experimental and control groups. The results were analysed to determine the average of spectral transmittance values, and the absolute differences between the measurements were calculated. All recorded values fell within the tolerance limits outlined in ISO 18369. This study concluded that neither type of eyedrop induced significant changes in spectral transmittance after 30 days of daily use as recommended by the manufacturer. All tested lenses (in the FDA categories) exhibited consistent spectral transmittance values throughout the study. Therefore, the eyedrops evaluated in this trial were deemed not to affect the spectral transmittance of any soft contact lens types.
- Full text:2026061015331154419Spectral Transmittance of Soft Contact Lenses.pdf
