Vision and the Human Eye

For many, vision is their most important sense

Good vision has its origin in the accurate focusing of sharp images on the retina of the eye. For normal vision, the optical system of the eye refracts light rays (images we see) so they are focused on the retina, typically in the fovea (macula), the area of highest resolution.

If one or more components of the eye are not precisely in tune, light rays are not focused on the retina, but rather in front or behind it, causing blurry images of the environment. This condition is referred to as refractive error, which is a collective term for nearsightedness (myopia), farsightedness (hyperopia) and astigmatism.

Anatomy of the human eye
Good vision requires accurate focussing of images on the retina
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