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Visual Function Under Bright Light Conditions Tested Using a Blue-Light Absorbing or Clear Lens in Pseudophakic
Billy R Hammond1, Jacob B Harth2, Lisa M Renzi-Hammond2
1Vision Sciences Laboratory, University of Georgia, Athens, GA, USA.
Current Eye Research
|April 1, 2025
Summary
A blue-light filter (BLF) significantly improved visual performance in pseudophakic patients. The BLF enhanced chromatic contrast and glare disability while reducing dysphotopsia symptoms like snowballs and spokes.
Area of Science:
- Ophthalmology
- Visual Optics
Background:
- Intraocular lenses (IOLs) with UV-only filters are common.
- Blue-light filtering (BLF) IOLs are designed to modulate light transmission.
- Evaluating the visual impact of BLFs is crucial for patient outcomes.
Purpose of the Study:
- To assess the visual performance of a blue-light filter (BLF).
- To quantify changes in glare disability (GD), chromatic contrast (CC), and dysphotopsia symptoms.
- To compare a BLF against a UV-only filter in pseudophakic patients.
Main Methods:
- A randomized cross-over study involving 25 pseudophakic patients with UV-only IOLs.
- Visual parameters including GD, CC, two-point light thresholds, and dysphotopsia (snowball/spoke diameter) were measured.
- A BLF (matching Acrysof Natural/Clareon IOLs) was compared to a UV-only filter control.
Main Results:
- The BLF significantly improved chromatic contrast (2.04 vs 1.83 LRE) and glare disability (2.46 vs 2.27 LRE).
- Dysphotopsia symptoms were reduced: snowball diameter decreased (49 vs 69 mm) and spoke diameter reduced (139 vs 171).
- More light energy was required to obscure targets, indicating better visual function with the BLF.
Conclusions:
- The blue-light filter demonstrated significant improvements in visual function across multiple parameters.
- BLF technology effectively reduces glare, enhances contrast, and mitigates visual disturbances like snowballs and spokes.
- These findings support the use of BLFs in intraocular lenses for enhanced visual quality.
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