Question

Define Myopia hypermetropia and Astigmatism

Answer 1

Answer:

The most common refractive errors are astigmatism, hyperopia (farsightedness) and myopia (nearsightedness). Astigmatism is a condition in which an abnormal curvature of the cornea can cause two focal points to fall in two different locations, making objects up close and at a distance appear blurry.

Answer 2

→There are 3 Defects of eye:

• Myopia: It occurs when the eyeball is too long, relative to the focusing power of the cornea and lens of the eye.This causes light rays to focus at a point in front of the retina, rather than directly on its surface.
• Hypermetropia: It occurs when the eye in which light is focused behind, instead of on, the retina.This results in close objects appearing blurry, while far objects may appear normal.As the condition worsens, objects at all distances may be blurry.
• Astigmatism: It occurs when the cornea (the clear front cover of the eye) is irregularly shaped or sometimes because of the curvature of the lens inside the eye.