by daniel | Nov 16, 2016 | Common Definitions in Eye Care
Cornea A clear membrane that lies in front of the iris (colored part of the eye) and pupil. It is commonly referred to as the “front of the eye.” It is literally the window to the eye and has tremedous focusing power for the eye. It determines 80% of the...
by daniel | Nov 16, 2016 | Common Definitions in Eye Care
Presbyopia A universal aging process that occurs in all people regardless of whether or not glasses were necessary as a child or during young adulthood. This is a loss of the ability to focus on near objects. It generally becomes evident during the 40’s and will...
by daniel | Nov 16, 2016 | Glasses Terminology
UV Tint Not really a “tint”, but a clear chemical coating used to filter out ultraviolet light. More than a dozen studies have shown that chonic exposure to sunlight without proper protection can increase the chances of developing age-related eye diseases...
by daniel | Nov 16, 2016 | Common Definitions in Eye Care
Dry Eye A condition that occurs when the tear gland (See lacrimal gland this section) produces less tears creating a dry eye surface. (For more information, please see
by daniel | Nov 16, 2016 | Common Definitions in Eye Care
Pupil The opening created by the iris through which light passes on to the retina. Unlike what is generally believed, this structure only regulates the amount of light entering the eye and does not actually “focus,” although depth of field is affected by...
by daniel | Nov 16, 2016 | Glasses Terminology
Vertex Distance The distance between a corrective lens and the cornea. An important measurement with moderate to high refractive errors since the final power of a glasses lens or contact lens will depend upon its distance from the retina.
