Age-dependent changes in visual sensitivity induced by moving fixation points in adduction and abduction using imo perimetry

AI Generated Summary*

Because horizontal eye movements can deform the optic nerve head, a cross-sectional imo perimetry study assessed whether sensitivity is measurable with fixation shifted 6 degrees into adduction or abduction. Twenty-nine healthy eyes from adults aged 45 or under, and 28 from adults over 45, were tested at 36 points. Younger eyes averaged 29.9, 29.9 and 30.0 dB for central, adducted and abducted fixation, without positional differences. Older eyes averaged 27.7, 27.5 and 28.1 dB; abduction significantly exceeded central gaze (0.4 dB, p = 0.025) and adduction (0.6 dB, p = 0.033). Mean deviation, foveal sensitivity and visual field index did not differ across positions, and the authors note such small differences may lack clinical meaning.

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