by daniel | Nov 16, 2016 | Common Definitions in Eye Care
Astigmatism An optical error in which there are two or more abnormal focal point in the eye, unlike hyperopia (farsightedness) or myopia (nearsightedness) where there is just one abnormal focal point that needs correcting. (See Refractive Disorders for more details.)...
by daniel | Nov 16, 2016 | Common Definitions in Eye Care
Lens The structure that sits behind the pupil and which acts to focus light onto the retina just as a camera lens focus light onto the film inside. (See Eye Anatomy and How The Eye Works for more details.) The lens is normally crystal clear, and cannot be seen with...
by daniel | Nov 16, 2016 | Glasses Terminology
High Index Lenses Lenses that are “denser” and much thinner. These are extremely appealing to those wearing strong corrections. Why? There are two aspects about lenses that correct for near and farsightedness. The lens material and the curve. The greater...
by daniel | Nov 16, 2016 | Common Definitions in Eye Care
Refraction Part of an eye exam that determines the optical error of the eye. This is often used to measure for the strength of glasses or contacts needed to see well. It is useful in determining if there were any changes in the eye\’s ability to focus as seen in...
by daniel | Nov 16, 2016 | Common Definitions in Eye Care
Macular Degeneration Deterioration of the macular region of the retina resulting in loss of central vision. (See FAQ’s on Macular Degeneration for an extensive discussion.)
by daniel | Nov 16, 2016 | Glasses Terminology
No-line (progressive) bifocal Actually a type of trifocal with unique optics that allow reading and other “near” activities. There is no visible bifocal or trifocal line which is appealing cosmetically to many people. Often called a “graduated”...
