Question

The eye defect caused due to shortening of the eyeball from front to back is______

Answer 1

Hint: Eye defects generally cause with ageing but some eye defects are caused by harmful radiation from the mobile phone, from the computer, and from the sun. Due to some eye defects, a person is unable to see the nearby object, far object and in some cases, vision is completely lost.

Complete answer:
The eye defect caused due to shortening of the eyeball from front to back is hyperopia.

Additional Information: Hyperopia is also known as farsightedness, in this defect a person has a problem while seeing the nearby object. Image formation takes place behind the retina. When the refractive power of the lens becomes weak, the eyeball becomes short. The convex lens helps to cure hyperopia by focusing an image on the retina.
Myopia is also known as nearsightedness, in this defect a person has a problem while seeing the far object. Image formation takes place in front of the retina. When the refractive power of the lens becomes too strong, the eyeball becomes long. The concave lens helps to cure myopia by focusing an image on the retina.
Astigmatism is caused by non-uniform curvature of the cornea. In this case, light rays do not focus on a single point, some rays lie behind the retina, some rays lie in front of the retina and some rays lie on the retina. In this case, a person is unable to see objects clearly, some object appears clear and some appear as a blur. This defect is cured by the spherical lens.
All these are eye defects while cataracts, age-related macular degeneration, and glaucoma are eye problems.

Note: Vitamin A containing food is important to improve the vision but once the eye defect forms, proper eyewear is necessary which helps to maintain eye health and potentially enhance eye vision.