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If a patient has a distance vision of 20/50, what does it mean?

A. He can see the Snellen chart clearly at 50 feet.
B. He is legally blind.
C. He can see at 20 feet what others can see at 50 feet.
D. He can see at 50 feet what others can see at 20 feet.

Answer :

A patient with a distance vision of 20/50 can see at 20 feet what others can see at 50 feet (C). This is related to their ability to read letters on a Snellen chart, which measures visual acuity. 20/50 vision does not indicate legal blindness and is not superior to normal vision at greater distances.

If a patient has a distance vision of 20/50, it means that they can see at 20 feet what others can see at 50 feet. This assessment comes from using a Snellen chart, which is designed to test visual acuity by presenting letters of various sizes that a person with normal vision should be able to read at specific distances.

For instance, someone with 20/20 vision can see at 20 feet what the average person can see at the same distance, which would be the smallest letters that subtend a visual angle of 5 minutes of an arc at 20 feet.

However, 20/50 vision implies the person can only see at 20 feet what a person with 'standard' vision can see at 50 feet away.

The correct answer to the given multiple-choice question is C: he can see at 20 feet what others can see at 50 feet. Option A suggests a clarity of vision at longer distances which does not align with 20/50 vision.

Option B is incorrect as legal blindness is defined as visual acuity that is 20/200 or less in both eyes even after correction.

Option D suggests a greater level of visual acuity than 20/50, by implying that the patient can see better at a distance than someone with normal vision, which is not accurate.

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Rewritten by : Barada