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The amblyopia treatment study visual acuity testing protocol.

J M Holmes¹, R W Beck, M X Repka

¹Mayo Clinic, Ophthalmology West 7, Rochester, MN 55905, USA. holmes.jonathan@mayo.edu

Archives of Ophthalmology (Chicago, Ill. : 1960)

|September 27, 2001

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A new visual acuity testing protocol using isolated surrounded HOTV optotypes demonstrates high testability in children aged 3-7 years and excellent reliability. This standardized approach is valuable for amblyopia research and clinical practice.

Area of Science:

Ophthalmology
Pediatric Optometry
Clinical Research

Background:

Accurate visual acuity measurement in children is crucial for early detection of vision disorders like amblyopia.
Existing visual acuity tests may present challenges in testability and reliability among young children.
Standardized protocols are needed to ensure consistent and comparable visual acuity data in pediatric populations.

Purpose of the Study:

To evaluate the testability and test-retest reliability of a novel visual acuity testing protocol.
To assess the performance of isolated surrounded HOTV optotypes for pediatric visual acuity assessment.
To determine the suitability of the protocol for use in multicenter clinical trials.

Main Methods:

The study involved pilot testing and modification of a visual acuity protocol using isolated surrounded HOTV optotypes presented via the Baylor-Video Acuity Tester (BVAT).

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Testability was assessed in 178 children aged 2-7 years across 6 sites.

Test-retest reliability was evaluated in a subset of 88 children, with 28% diagnosed with amblyopia.

Main Results:

Testability of the modified protocol ranged from 24% in 2-year-olds to 96% in 5- to 7-year-olds.
High test-retest reliability was observed (r = 0.82), with 93% of scores within 0.1 logMAR units.
Confidence intervals for acuity scores and changes in scores were established.

Conclusions:

The visual acuity protocol demonstrated high testability in children aged 3-7 years and excellent test-retest reliability.
The protocol has been adopted by the multicenter Amblyopia Treatment Study.
This standardized protocol holds significant potential for improving visual acuity testing consistency in children.