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Related Experiment Video

Updated: Jul 6, 2026

Measuring the Behavioral Effects of Intraocular Scatter

Measuring the Behavioral Effects of Intraocular Scatter

Published on: February 18, 2021

Glare and halo with refractive correction.

Richard J Allen¹, George M Saleh, Andre S Litwin

¹Ophthalmology, Essex County Hospital, Colchester, United Kingdom. richardallen_@btopenworld

Clinical & Experimental Optometry

|March 20, 2008

Summary

This summary is machine-generated.

Contact lens and unclean spectacle wearers experience larger halos than those with clean spectacles or no correction. Lens cleanliness significantly impacts visual disturbances like halos.

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Published on: September 16, 2025

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Last Updated: Jul 6, 2026

Measuring the Behavioral Effects of Intraocular Scatter

Measuring the Behavioral Effects of Intraocular Scatter

Published on: February 18, 2021

$Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter$

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter

Published on: September 16, 2025

Area of Science:

Ophthalmology
Visual Optics

Background:

Assessing visual disturbances like glare and halo is crucial for understanding refractive correction methods.
Previous research has not comprehensively compared these phenomena across different correction types.

Purpose of the Study:

To compare the subjective experience of glare and halo in pre-presbyopic individuals using various refractive correction methods.
To evaluate the impact of spectacle lens cleanliness on visual quality.

Main Methods:

Ninety-eight healthy pre-presbyopic eyes were analyzed for glare and halo perception using computer-generated stimuli.
Participants were grouped into emmetropes (no correction), single vision spectacle wearers (clean/dirty lenses), and soft contact lens wearers.

Main Results:

No significant differences in glare perception were observed across all groups.
Halos were significantly larger in contact lens wearers and those with unclean spectacles compared to emmetropes.
Cleaning spectacle lenses led to a significant reduction in halo size.

Conclusions:

Contact lens and unclean spectacle wearers report significantly larger halos than emmetropes and those with clean spectacles.
Spectacle lens cleanliness is a critical factor influencing halo perception.
Unclean spectacles can potentially compromise the accuracy of psychophysical and clinical vision testing.