key term - Myopia

Definition

Myopia, or nearsightedness, is a common vision condition where close objects are seen clearly, but distant objects appear blurry. It occurs when the eye's shape causes light rays to bend (refract) incorrectly, focusing images in front of your retina instead of on your retina.

5 Must Know Facts For Your Next Test

1. Myopia occurs because the eyeball is too long or the cornea is too curved.
2. Concave lenses are used in glasses and contact lenses to correct myopia by diverging light rays before they enter the eye.
3. The degree of myopia is measured in diopters; higher negative values indicate more severe myopia.
4. Laser eye surgeries like LASIK can reshape the cornea to correct myopia.
5. Genetic and environmental factors, such as prolonged near work and limited outdoor activities, contribute to the development of myopia.

Review Questions

Related terms

Hyperopia:

A vision condition also known as farsightedness, where distant objects are seen more clearly than close ones due to light focusing behind the retina.

Astigmatism:

A common imperfection in the curvature of your eye that causes blurred distance and near vision.

$Diopter$: $A$ unit of measurement for the optical power of a lens. A negative diopter value indicates a concave lens used for correcting myopia.