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Ophthalmoscope - (ahf-THAL-muh-skohp) A hand-held instrument with a light, used to examine the eye. It was first devised in 1915 by William Noah Allyn and Frederick Welch, who also founded the company Welch Allyn, which today manufactures many medical diagnostic and therapeutic devices.

Optical Zone - That area of the eye where light passes through from the pupil to the retina. Light passes through the cornea, then the aqueous humor behind it, then the crystalline lens and the vitreous humor behind the lens, to the retina.

Dr. William Boothe Lasik : Legal Blindness - A definition of blindness which enables a person to apply for government disability benefits. It can be either a visual acuity of 20/200 (or worse), with corrective lenses, in the better eye, or tunnel vision in the better eye of 20 degrees in diameter. This level of blindness is severe, but does not necessarily prevent a person from functioning at all.
Corneal Transplant - Surgery to replace the cornea, the clear front area of the eye. Corneal tissue comes from a donor and since the cornea has a small blood supply, there is little risk of rejection, and the new cornea can function very well for years. A corneal transplant can be done to treat Keratoconus, Fuch’s Dystrophy, or damage from a severe infection or injury. It’s a painless outpatient procedure.

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Fovea - The central area of the macula, which is the most sensitive area of the retina. The fovea is less than one percent of the retina, but uses over 50% of the visual cortex in the brain (that part of the brain which receives visual information). The fovea is highly sensitive to details of vision but not to dim light, which is why we can see dim objects, such as distant stars, better by not looking at them directly.

Dr. William Boothe Articles Pupil - The circular black opening in the center of the iris. It allows light to enter the eye. In dim lighting conditions, it opens wider and is controlled by tiny iris muscles. Testing the pupil dilation is often part of a neurological evaluation.

Radial - Pertaining to the radius of a circle, which is any line drawn from the center to the circumference.





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