A new, adaptive, self-administered, and generalizable method used to measure visual acuity.

Area of Science:

• Ophthalmology and Vision Science
• Psychophysics
• Clinical Measurement

Background:

• Assessing visual acuity (VA) is crucial for diagnosing and monitoring eye conditions.
• Current VA tests may have limitations in detecting specific visual aberrations like astigmatism.
• There is a need for adaptive, self-administered methods to evaluate visual functions.

Purpose of the Study:

• To introduce Angular Indication Measurement (AIM) as a novel method for visual function assessment.
• To apply AIM to visual acuity testing (AIM-VA) in a proof-of-concept study.
• To evaluate AIM-VA's performance in detecting defocus and astigmatic blur.

Main Methods:

• Compared AIM-VA and Early Treatment of Diabetic Retinopathy Study (ETDRS) charts in 22 adults.
• Induced artificial defocus and astigmatic blur using spherical and cylindrical lenses.
• Assessed repeatability of AIM-VA and ETDRS over two test sessions.

Main Results:

• AIM-VA demonstrated comparable ability to detect defocus compared to ETDRS charts.
• AIM-VA showed significantly greater sensitivity to astigmatic blur than ETDRS.
• Repeatability of AIM-VA was comparable to ETDRS with two or more adaptive steps, with minimal bias and no learning effect.

Conclusions:

• AIM-VA is a promising, adaptive, self-administered method for visual acuity assessment.
• AIM-VA offers enhanced sensitivity to astigmatic blur compared to standard ETDRS charts.
• The AIM methodology is generalizable for assessing other visual functions like contrast, color, motion, and stereovision.