American Board of Opticianry (ABO) Practice Test

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Which test is commonly used to screen for color blindness?

Snellen test
Amsler grid
Visual field test
Ishihara test

The correct answer is: Ishihara test

The Snellen test is used to measure visual acuity, not screen for color blindness. The Amsler grid is used for detecting central visual field defects, which are not indicative of color blindness. The visual field test is used to detect peripheral vision issues, again unrelated to color blindness. The Ishihara test is specifically designed to screen for color blindness by presenting images with hidden numbers or patterns that only those with normal color vision can see.