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Published on: February 18, 2021
Quantitative analysis of visual acuity through amber discolored lenses
R E Gundel1, E N Kaplan, J S Rosen
1Contact Lens Research Group, State College of Optometry, State University of New York, New York.
Summary
Discolored hydrogel contact lenses did not significantly impact visual acuity in a study. This suggests discoloration may not be a valid reason for contact lens replacement based on vision quality.
Area of Science:
- Ophthalmic optics
- Materials science
Background:
- Contact lens discoloration is a common clinical issue.
- Lens replacement is often based on discoloration, lacking a scientific basis related to vision quality.
Purpose of the Study:
- To investigate the association between hydrogel contact lens discoloration and visual acuity.
- To determine if discoloration compromises high or low contrast visual acuity.
Main Methods:
- Hydrophilic contact lenses (Methafilcon-A) were discolored using potassium sorbate solution.
- A spectrum of discolored lenses with peak absorbance at 320 nm was created.
- Visual acuity (high/low contrast) was tested in 15 subjects wearing discolored and non-discolored lenses.
Main Results:
- No statistically significant differences were found in high or low contrast visual acuity between discolored and non-discolored lenses.
- Paired t-test analysis at the 99% significance level supported these findings.
Conclusions:
- Hydrogel contact lens discoloration, as induced in this study, does not appear to compromise visual acuity.
- A more scientific rationale than discoloration alone may be needed for contact lens replacement.
