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Byju's Answer
Standard IX
Biology
Eye Diseases and Taking Care of Our Eyes
Name the kind...
Question
Name the kind of lens required to correct myopia.
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Solution
Myopia is also known as near-sightedness or short- sightedness.
It is the condition of the eye where light focuses in front of the retina, instead of on the retina.
This causes far objects to be blurry while close objects appear normal.
A concave lens (minus powered) is used for correcting a myopic eye.
This helps to move the image back to the retina and helps to clarify the image.
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(a) What is myopia?
(b) What are the causes of myopia?
(c) Draw three labelled ray-diagrams to show the defect of vision called myopia and how it is corrected by the use of lenses.
ā(d) The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the defect?