Explanation
A concave lens is employed to correct myopia.
Myopia, also known as nearsightedness, is a refractive error of the eye where distant objects appear blurry, while close objects can be seen clearly. This occurs when the eye is too long, or the cornea and lens are too curved, causing light rays to focus in front of the retina instead of on it. To correct myopia, a concave lens is used to diverge the incoming light rays, so that they are focused correctly on the retina, resulting in clearer distance vision.
Presbyopia is a condition that occurs with age where the lens of the eye loses its ability to change shape, resulting in difficulty seeing objects up close. Hypermetropia, also known as farsightedness, is a refractive error where distant objects are seen more clearly than near objects, which occurs when the eye is too short or the cornea and lens are too flat. Cataract is a clouding of the lens of the eye that can cause blurry vision and decreased visual acuity.
Therefore, the correct answer is D: Myopia.
