A pinhole aperture (PH) for visual acuity tests
Channel: DR:Hisham esam
Date: 06/02/2021

AV hole: A pinhole aperture (PH) compensates for the effect of refractive error and consists of an opaque occluder drilled by one or more holes approximately 1mm in diameter. However, the acuity of PH in patients with macular disease and
     Posterior lens opacities may be worse than with spectacle correction. If the VA is less than the Snellen equivalent 6/6, the test is repeated using a pinhole aperture.
     • Binocular VA is usually superior to the best monocular VA
     from each eye, at least where both eyes have roughly the same vision.
    Very poor visual acuity
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