What Is 20/40 Vision? Meaning, Clarity & Correction Options
What is 20/40 Vision? 20/40 vision is a standard measurement of visual acuity that describes how well a person sees at a distance. This term is derived from the Snellen eye chart test, which is used by eye care professionals to assess vision clarity. If you have 20/40 vision, it means that you must be […]
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