Question

Which type of lens is used to treat myopia?
A) Concave lens
B) Convex lens
C) Cylindrical lens
D) Bifocal lens

Answer 1

Hint: Myopia, or short-sightedness, is a common refractive error that can occur in both adults and children. It is most common in those aged under forty, typically beginning during childhood. Myopia occurs when the eye lens grows slightly too long or more curved than usual, meaning that light can’t focus on the retina correctly. Instead, the light is focused in front of the retina, which makes distant objects appear blurry.

Complete step by step solution:
In most cases, myopia stabilizes in early adulthood, but it can sometimes continue progressing further in later ages. Wearing glasses for myopia is a common and effective solution. Your local optician can determine how strong your lenses need to be to deliver a clear vision. Single vision lenses are used to correct myopia.

Glasses for myopia allow the light to reflect on the correct part of the retina. Glasses for myopia are often created with a concave (curved inwards) lens, which moves the focus of the light to help you see clearly. The light rays which are converged before the retina due to myopia are diverged further by the concave lenses so that a clear image is formed at the retina and the vision is not blurry.

Hence we can say that a concave lens is used to treat myopia or option (A) is the correct answer to our question.

Note: In addition to near-sightedness, other refractive errors or eye defects include:
1. Farsightedness (hyperopia). This occurs when the eye lens is shorter than normal or is curved too little. The effect is the opposite of near-sightedness. In adults, both near and distant objects appear blurred. Far-sightedness is corrected with the use of convex lenses of suitable focal lengths.
2. Astigmatism. This occurs when your eye lens is curved more in one direction than in another. Uncorrected astigmatism blurs your vision.