Nearsightedness (myopia) and farsightedness (hyperopia) are two common refractive errors that affect how the eye focuses light. Here's the difference between the two:
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Nearsightedness (Myopia):
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Definition: Nearsightedness is a condition where nearby objects appear clear, but distant objects appear blurry.
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Cause: Nearsightedness occurs when the eyeball is too long, or the cornea (the clear front surface of the eye) is too curved. As a result, light entering the eye focuses in front of the retina instead of directly on it.
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Symptoms: Blurred distance vision, squinting to see distant objects, headaches or eyestrain when looking at faraway objects.
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Correction: Nearsightedness is usually corrected using concave (minus) lenses, which help to diverge the incoming light and move the focal point back onto the retina.
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Farsightedness (Hyperopia):
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Definition: Farsightedness is a condition where distant objects may appear clearer than nearby objects.
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Cause: Farsightedness occurs when the eyeball is too short, or the cornea is too flat. This causes light entering the eye to focus behind the retina instead of directly on it.
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Symptoms: Blurred close-up vision, eyestrain, difficulty focusing on nearby objects, headaches when doing close work.
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Correction: Farsightedness is usually corrected using convex (plus) lenses, which help to converge the incoming light and move the focal point onto the retina.
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