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Factors affecting light scatter in contact lens wearers
D B Elliott1, S Mitchell, D Whitaker
1Clinical Vision Research Unit, University of Bradford, West Yorkshire, England.
Summary
Light scatter increases with age and is higher in contact lens wearers, especially with hydrophilic lenses, suggesting potential corneal edema. Pigmentation also influences light scatter measurements.
Area of Science:
- Ophthalmology
- Corneal Physiology
- Vision Science
Background:
- Light scatter is a factor in visual quality.
- Age and contact lens wear can affect corneal properties.
Purpose of the Study:
- To investigate the relationship between age, contact lens wear, and light scatter.
- To assess corneal health and contact lens deposits in relation to stray light.
Main Methods:
- Measured forward light scatter at multiple angles using a stray light meter.
- Assessed corneal health via slitlamp biomicroscopy.
- Quantified contact lens deposits using specialized procedures.
Main Results:
- Light scatter significantly increased with age, particularly after 40.
- Pigmented subjects showed lower stray light scores.
- Contact lens wearers had higher stray light scores than normals, independent of deposit levels.
- Hydrophilic lens wearers exhibited higher scores post-removal than RGP wearers and normals.
Conclusions:
- Age and contact lens wear, especially hydrophilic types, are associated with increased light scatter.
- Elevated stray light in hydrophilic lens wearers may indicate subclinical corneal edema.
- Corneal health and visual performance are influenced by these factors.