The amblyopia treatment study visual acuity testing protocol

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).
• 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.