When rays are focused correctly on the retina of a relaxed eye, the eye is said to be emmetropic. Emmetropia is the medical term for 20/20 vision, vision that needs no corrective lenses, contact lenses, or reading glasses. It occurs because the optical power of the eye can perfectly focus an image to the retina, giving it “perfect” vision.

The opposite of emmetropia is ametropia. With ametropia, the focal point of the eye is some distance in front of or behind the retina.  The following vision conditions are types of ametropia.

Latest News

Pregnancy Can Change Your Eyes
February 21, 2024
We all know that during pregnancy, a woman's body goes through a great deal of change hormonally and physiologically.  But did you know her eyes change as...
Help for Those with Low Vision
February 14, 2024
Recent Census Bureau data shows a population of approximately 70 million baby boomers (the generation born from 1946-1964). What does that have to do with low v...