Which of the lenses are used to cure Myopia?

Option 2 : concave

The Correct Answer is concave.

• Concave lenses are used to cure Myopia.
• The term used to explain being short-sighted is myopia.
• When looking at objects close to them a myopic individual has perfect vision, but distant objects can appear blurred.
• This is because, in front of the retina, light is concentrated, and being so far ahead in the eye, objects appear distorted in the distance.
• Using a concave (curved inward) lens that is positioned in front of a myopic eye, transferring the vision back to the retina and making it clearer, shortsightedness is corrected.

• The term used to describe being longsighted is hypermetropia.
• If you are hypermetropic, the image of a surrounding object is generated behind the retina. This indicates that light is focused too far back into the eye causing the appearance of blurred objects nearby.
• Using a convex (outward facing) lens, longsightedness is corrected. This is situated in front of a hypermetropic eye, pushing the picture forward and correctly focusing it on the retina.
• Astigmatism: This defect arises due to the difference in the radius of the curvature of the cornea in the different planes.
  The cylindrical lens is used by people suffering from Astigmatism.
• Presbyopia arises due to the gradual weakening of the ciliary muscles and diminishing flexibility of the eye lens. It can be cured by using the bi-focal lens of the required power.