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Preschool vision screening: negative predictive value for amblyopia.

D K Newman¹, M M East

¹Department of Ophthalmology, Addenbrooke's Hospital, Cambridge CB2 2QQ.

The British Journal of Ophthalmology

|May 26, 1999

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Preschool vision screening achieves high negative predictive value (NPV) for amblyopia when using a low referral threshold and including cover tests and binocular function assessments. Single optotype tests alone have a lower NPV for detecting amblyopia.

Area of Science:

Ophthalmology
Pediatric Optometry
Public Health

Background:

Single optotype visual acuity tests are common in preschool screening for cooperation.
These tests may miss amblyopia due to lack of visual crowding.
This study evaluated the negative predictive value (NPV) for amblyopia.

Purpose of the Study:

To assess the NPV of preschool vision screening for amblyopia.
To determine if single optotype tests underestimate amblyopia deficits.
To identify conditions for high NPV in preschool amblyopia screening.

Main Methods:

A cohort study of 936 children in the Cambridge Health District.
Preschool vision screening at 3.5 years included Sheridan-Gardiner single optotype test (referral ≤6/9), cover test, ocular movements, prism, and TNO stereotest.

Related Experiment Videos

Amblyopia presence was confirmed using Snellen line acuity as the reference standard.

Main Results:

The overall NPV of the preschool vision screening for amblyopia was 100%.
The Sheridan-Gardiner single optotype test alone had an NPV of 99.6%.
Additional screening tests (cover test, binocular function) were crucial for preventing false negatives.

Conclusions:

Preschool vision screening achieves a high NPV for amblyopia with specific conditions.
A low referral threshold (≤6/9) is essential.
Inclusion of cover tests and binocular function tests is necessary for comprehensive screening.