Color Vision Screening (Ishihara Test)
Assess for red-green color blindness.
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Ensure proper room lighting and phone brightness.
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Wear any glasses necessary for near vision.
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Hold screen at a comfortable reading distance (~30 inches or 75 cm).
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Test each eye independently.
Advice
Patients with more than two incorrect plates are considered to have color vision deficiency.
Management
Patients with color vision deficiency should undergo further evaluation by an ophthalmologist or neuro-ophthalmologist.