Certified Ophthalmic Assistant Practice Exam

Visual acuity is a measure of the eye's ability to distinguish shapes and the details of objects at a particular distance. The notation for visual acuity is based on the Snellen chart, where the top number represents the testing distance, and the bottom number represents the distance at which a person with normal vision can see the same detail.

In this question, the person can clearly see an object at 20 feet that can be seen at 60 feet by a person with no refractive error. This means the person's vision is such that they need to be at 20 feet to see what a person with normal vision can see at 60 feet. Therefore, their visual acuity is noted as 20/60. This indicates that the person can see at 20 feet what a person with normal vision can see at 60 feet.

Option A (20/20) would indicate that the person has normal vision, seeing at 20 feet what a person with normal vision can see at 20 feet, which is not the case given the scenario provided.

Option B (20/40) and Option D (20/80) do not correlate with the information given about the person's ability to see an object at 20 feet that can be seen at 60 feet by a person with no refractive error.

Therefore, the correct answer is C, 20/60, reflecting the person's visual acuity as described in the question.