Ace the Certified Ophthalmic Assistant Exam 2026 – Eye-Opener Prep for Your Bright Future!

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What is the primary purpose of the Snellen chart?

To measure color perception

To assess visual acuity

The primary purpose of the Snellen chart is to assess visual acuity. This chart is specifically designed to measure how well a person can see at a distance, providing a standardized way to gauge the clarity or sharpness of vision. By having the patient read letters of varying sizes from a specified distance, healthcare providers can determine the smallest letters that can be discriminated and thus calculate the visual acuity, typically expressed as a fraction (e.g., 20/20 vision).

Other options focus on different aspects of vision: color perception pertains to how well one can distinguish colors; depth perception is about the ability to judge distances; and peripheral vision refers to the ability to see out of the corner of one's eye. However, these aspects are not assessed using the Snellen chart, making visual acuity its primary purpose.

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To test depth perception

To evaluate peripheral vision

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