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Randomized trialOptometry and vision science : official publication of the American Academy of Optometry · 2026

Testability and test-retest reliability of SpotChecks Contrast Sensitivity Test in children with unilateral amblyopia.

Vivian M Manh, Rui Wu, Michael E Gray … Pediatric Eye Disease Investigator Group

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OphthalmologyRandomized trial

SpotChecks contrast sensitivity test needs a 4-line change to detect a real difference.

Testability and test-retest reliability of SpotChecks Contrast Sensitivity Test in children with unilateral amblyopia.

Vivian M Manh … Pediatric Eye Disease Investigator Group

Optometry and vision science : official publication of the American Academy of Optometry · 2026

Purpose

To report testability and test-retest reliability of the SpotChecks contrast sensitivity (contrast sensitivity) test in amblyopic and nonamblyopic eyes of children with unilateral amblyopia.

Methods

Children aged 3-12 years with unilateral amblyopia due to strabismus and/or anisometropia were recruited as part of a randomized trial.

n = 76 test-retest pairs

Results

test scores had to differ by this much to reflect a true change, not noise

MD 0.01 (95% CI -0.02 to 0.03)

CI crosses the null - not significant

More results

In children aged 3-6 years, 81% (117/145) passed the pre-test: 17 of 34 (50%) 3-year-olds, 39 of 46 (85%) 4-year-olds, 33 of 37 (89%) 5-year-olds, and 28 of 28 (100%) 6-year-olds.

Fifty-four of 117 (46%) who passed the pre-test had matching test pairs for analysis.

In children aged 7-12 years, all 45 passed the pre-test.

More results

Twenty-two of 45 (49%) who passed the pre-test had matching test pairs for analysis.

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Conclusion · 1 of 2

Children aged 6-12 years were more likely to be testable. Regardless of age, half of all test-retest pairs were completed incorrectly, possibly due to examiner or participant-related factors.

Conclusion · 2 of 2

A greater than 4-line (0.20 logCS) change on the SpotChecks contrast sensitivity test is required to detect a change in contrast sensitivity function beyond measurement error in children 3-12 years of age with unilateral amblyopia.

Post

Testability and test-retest reliability of SpotChecks Contrast Sensitivity Test in children with unilateral amblyopia.

SpotChecks contrast sensitivity test needs a 4-line change to detect a real difference.

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