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Study of accommodative facility testing reliability.

K M McKenzie, S R Kerr, M W Rouse

    American Journal of Optometry and Physiological Optics
    |March 1, 1987
    PubMed
    Summary
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    Accommodative facility testing shows improved results with retesting, especially for those initially failing. This indicates test-retest variability can impact children's pass/fail status in vision assessments.

    Area of Science:

    • Ophthalmology
    • Pediatric Optometry
    • Vision Science

    Background:

    • Accommodative facility testing assesses the eye's ability to adjust focus.
    • Reliability of vision testing procedures is crucial for accurate diagnosis in children.
    • Previous studies have not fully established the test-retest reliability of accommodative facility measurements.

    Purpose of the Study:

    • To evaluate the test-retest reliability of the accommodative facility testing procedure in children.
    • To determine if repeated testing affects the pass/fail classification of subjects.
    • To identify specific subgroups most affected by test-retest variability.

    Main Methods:

    • Sixty-six subjects aged 8-12 years underwent monocular and binocular accommodative facility testing over three weeks.

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  • Testing utilized +2 D and -2 D lenses.
  • Subjects were categorized as 'pass' or 'fail' based on initial test results (monocular ≥11 cpm, binocular ≥8 cpm).

    • Main Results:

    • A significant mean increase in accommodative facility (cycles per minute, cpm) was observed between initial and subsequent testing periods for the group.
    • No significant changes in pass/fail status were found in the 'pass' category.
    • A significant increase in the passing rate was observed in the 'fail' category, primarily among 'high-fail' subjects.

    Conclusions:

    • The accommodative facility testing procedure demonstrates variability, particularly for children initially classified as failing.
    • Retesting can lead to improved scores, potentially altering a child's pass/fail status.
    • The findings highlight the importance of considering test-retest effects when interpreting accommodative facility results in pediatric populations.