When is the most worst prescription for eyes?!

Question: When someone checks his sight, the doc tells him his prescription or degree of his sight. What is considered the worse?

Answers: When someone checks his sight, the doc tells him his prescription or degree of his sight. What is considered the worse?

20/200 or less(for example 20/400....etc). You are considered legally blind at this distance. My brother vision is 20/200 in his left eye, so this is how I know!

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When is the most worst prescription for eyes?!

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