What is the primary role of a lens in vision correction?

The primary role of a lens in vision correction is to refract light to a focal point on the retina. This process is essential for clear vision, as the lens bends incoming light rays so they converge correctly onto the retina, which is the light-sensitive layer at the back of the eye. If light is not focused accurately on the retina, it can result in blurriness or distortion of images.

When a lens is used in glasses or contact lenses, it is specifically designed based on the individual's visual requirements, such as whether they are nearsighted or farsighted. The goal is to ensure that light is directed precisely where it needs to be to allow for clear images to be perceived by the brain.

While magnification, filtering of harmful light, and providing a tint can be additional features that lenses may have, these are not the fundamental purpose of vision correction. The primary function remains the accurate refraction of light to achieve proper focus on the retina.