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Related Experiment Videos

The effect of cycloplegia on the visual contrast sensitivity function.

W G Bachman, I Behar

    Aviation, Space, and Environmental Medicine
    |April 1, 1987
    PubMed
    Summary

    Cycloplegia slightly reduces contrast sensitivity in normal conditions and more significantly under glare. This effect is more pronounced at higher spatial frequencies, impacting Army aviator visual standards.

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    Area of Science:

    • Ophthalmology
    • Visual Science
    • Military Aviation Medicine

    Background:

    • Contrast sensitivity is a key visual function considered for Army aviator selection.
    • Cycloplegic refraction is a standard procedure for initial candidate screening.
    • The impact of cycloplegia on contrast sensitivity requires investigation for accurate visual standards.

    Purpose of the Study:

    • To determine the effect of cycloplegia on contrast sensitivity function.
    • To assess if cycloplegia alters contrast sensitivity under normal and glare conditions.
    • To evaluate the influence of spatial frequency on cycloplegia's effect.

    Main Methods:

    • 12 Army officer candidates undergoing flight training were tested.
    • Contrast sensitivity functions were measured under normal and glare conditions.
    • Measurements were taken with both manifest and cycloplegic refractions.

    Main Results:

    • Cycloplegia caused a minor decrease in contrast sensitivity in normal ambient conditions.
    • A more substantial reduction in contrast sensitivity was observed under glare conditions.
    • The negative impact of cycloplegia on contrast sensitivity was greater for higher spatial frequencies.

    Conclusions:

    • Cycloplegia has a measurable, albeit small, effect on contrast sensitivity.
    • The reduction in contrast sensitivity due to cycloplegia is exacerbated by glare.
    • These findings are important for establishing reliable visual standards for Army aviators.

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