The human eye is a complex optical instrument that uses refraction through a lens system to focus light onto the retina and create images. Understandi
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Why do myopic people see better when they squeeze their eyes or look through a hole?
Squeezing the eyes or looking through a small hole increases the depth of field, allowing blurry images to appear sharper. This is a temporary trick that does not correct the actual focus problem; proper glasses are needed.
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Can LASIK surgery permanently cure myopia?
LASIK surgery reshapes the cornea to correct myopia, and the results are usually permanent for adults. However, the eye can still change shape with age, and presbyopia develops later. LASIK is not suitable for young children whose eyes are still growing.
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Why do people with presbyopia need bifocals?
Bifocals have two different lens powers: the upper portion for distance vision and the lower portion (stronger) for near vision. This allows the person to see clearly at both distances without removing glasses.
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