Vision Information

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(from Greek: μυωπία myopia “near-sightedness”), also called near- or short-sightedness.

Those with myopia see nearby objects clearly but distant objects appear blurred. With myopia, the eyeball is too long, or the cornea is too steep, so images are focused in the vitreous inside the eye rather than on the retina at the back of the eye. The opposite defect of myopia is hyperopia or “farsightedness” or “long-sightedness” — this is where the cornea is too flat or the eye is too short.

Word For Today: Visual acuity

(VA) is acuteness or clearness of vision, especially form vision.

VA is a measure of the ability to identify black symbols on a white background at a standardized distance as the size of the symbols is varied. The VA represents the smallest size that can be reliably identified. VA is the most common clinical measurement of visual function. The well-known phrase “20-20 vision” refers to the distance in feet that objects separated by an angle of 1 arc minute can be distinguished as separate objects. The metric equivalent is 6-6 vision.

Or, for easier reading check out my article on “Eye Charts, How Do They Work”

thanks to wikipedia!

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