What question did this study set out to answer?

The aim is to evaluate how different contrast levels in test charts affect visual acuity measurements.

March 21, 2026

Low Contrast Charts Effectively Differentiate between Types of Blur

AHArthur HoBrien Holden Vision Institute SBSUSAN M. BILTONUNSW Sydney

Key Points

The aim is to evaluate how different contrast levels in test charts affect visual acuity measurements.
Utilized test charts with three contrast levels
Measured visual acuity in six subjects at distance and near
Assessed impact of refractive defocus and diffusive blur on acuity.
Reduced acuity due to refractive defocus was consistent across contrast levels
Greater reduction in acuity observed with medium and low contrast for diffusive blur
Advocacy for using two different contrast levels to identify causes of visual degradation.

Abstract

ABSTRACT Test charts with three different contrast levels were used to measure acuity of six subjects at distance and near. Reduction in measured acuity as a result of refractive defocus was shown to be independent of contrast level. Reduction in measured acuity with diffusive blur was greater on the medium and low contrast charts than on the high contrast chart. We advocate the use of charts with two different contrast levels to help differentiate between causes of visual degradation.

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