A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision?

A person with myopia, also known as nearsightedness, can see objects up close clearly but has difficulty seeing distant objects. Myopia occurs when the eyeball is too long or the cornea has too much curvature, causing light entering the eye to focus in front of the retina instead of directly on it.

To correct myopia and restore proper vision for distance viewing, a diverging or concave lens is used. A concave lens is thinner at the center and thicker at the edges. This type of lens helps to spread out the incoming light rays before they enter the eye, allowing them to converge properly on the retina. The use of a concave lens compensates for the excessive focusing power of the myopic eye.

In summary, for a person with myopia (nearsightedness) who cannot see objects beyond 1.2 meters distinctly, a concave or diverging lens should be prescribed to correct their vision for distant objects. The power of the concave lens would be determined by an eye examination, and it would be measured in diopters (D).