ABO NOCE Practice Test

What is the primary use of a concave lens in vision correction?

1. To converge light

2. To diverge light

3. To flatten the cornea

4. To enhance peripheral vision

The correct answer is: To diverge light

A concave lens is primarily used in vision correction to diverge light rays. This is particularly beneficial for individuals who are nearsighted, or myopic, as it allows the light entering the eye to spread out before it reaches the lens of the eye. By diverging the light, a concave lens helps to focus the images correctly on the retina, rather than in front of it, which is where the light would typically focus in a nearsighted eye. In contrast, a convex lens converges light rays and is utilized for correcting farsightedness, where the light focuses behind the retina. Other options, such as flattening the cornea or enhancing peripheral vision, do not relate to the primary function of concave lenses in vision correction. These treatments or enhancements involve different optical devices or surgical procedures altogether.