Question

LASIK surgery uses a laser to modify the a) curvature of the retina. b) index of refraction of the aqueous humor. c) curvature of the lens. d) curvature of the cornea.

Short answer

Answer: LASIK surgery modifies the curvature of the cornea to correct vision problems.

Step-by-step solution

Identify LASIK Surgery Purpose

LASIK (Laser-Assisted in Situ Keratomileusis) is a type of refractive eye surgery that aims to correct vision problems, such as myopia (nearsightedness), hyperopia (farsightedness), and astigmatism. The surgery works by reshaping the cornea so that light entering the eye can be properly focused onto the retina, resulting in clear vision.

Analyze Each Statement

a) Curvature of the retina: The retina is the light-sensitive tissue located at the back of the eye. It receives light and sends visual signals to the brain. LASIK surgery does not modify the curvature of the retina. b) Index of refraction of the aqueous humor: The aqueous humor is a clear, watery fluid located between the cornea and the lens. It provides nutrition and maintains the shape of the eye. LASIK surgery does not change the index of refraction of the aqueous humor. c) Curvature of the lens: The lens is located behind the iris and helps to focus light onto the retina. Although the lens is involved in the focusing process, LASIK surgery does not modify the curvature of the lens. d) Curvature of the cornea: The cornea is the clear, front surface of the eye that focuses light onto the retina. LASIK surgery reshapes the curvature of the cornea so that light can be properly focused, resulting in clear vision.

Choose the Correct Statement

Based on the analysis, we can conclude that option d) Curvature of the cornea is the correct answer, as LASIK surgery modifies the curvature of the cornea to correct vision problems.