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Answer :
Final answer:
The '20' in a 20/50 visual acuity reading represents the distance in feet at which a person with normal vision can see the letters that the person with 20/50 vision can see at 50 feet.
Explanation:
In an optometry test using a Snellen chart, the reading '20/50' indicates a person's visual acuity. The number '20' represents the distance in feet at which a person with normal vision can see the same line of letters that the person being tested can see at 50 feet. This means that what a person with 20/50 vision sees at 50 feet, a person with normal visual acuity can see at 20 feet. The Snellen chart is a standard method used to approximate visual clarity and sharpness.
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Answer:
In a visual acuity reading, the first number (e.g., 20 in 20/50) represents the testing distance in feet. In the case of 20/50, it means that the person being tested can see at 20 feet what a person with normal vision can see at 50 feet.
So, in the context of 20/50 visual acuity, the 20 represents the testing distance in feet. The larger this number, the worse the visual acuity, as it indicates that the person can see at a shorter distance what a person with normal vision could see at a longer distance.
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