Fovea A depression in the retina that contains only cones (not rods), and that provides acute eyesight.
Photoreceptor A light-sensitive cell found in the retina. Photoreceptors in the human retina are classified as cones and rods. Cones are located in the central retina (the fovea) and control color vision. Rods are located outside the fovea and control black/white vision in low-light conditions.( -
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Dr Boothe Before Lasik Article: Peripheral vision The edges of your visual field.
Cornea The clear part of the eye covering the iris and pupil; it lets light into the eye, permitting sight.
Corneal opacity A cloudy spot in the cornea, which is normally transparent. Causes include corneal scar tissue and infection. Symptoms include halos around lights, photophobia, vision loss and a white or cloudy spot on the eye. (
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Enzymatic cleaner A cleaner that removes protein deposits and other debris from contact lenses. It's recommended for use either daily, weekly, or monthly. Some enzymatic cleaners are a small tablet dropped into a solution along with the lens; others come in liquid form.
Lens 1. The nearly spherical body in the eye, located behind the cornea, that focuses light rays onto the retina. 2. A device used to focus light into the eye in order to magnify or minify images, or otherwise correct visual problems. Eyeglass lenses, contact lenses, and intraocular lenses are examples. Sometimes a lens provides only a cosmetic benefit, as in non-correcting color contacts, theatrical contact lenses, or contacts that hide a disfigurement of the eye. Other times a lens protects the eye, as in safety glasses or sunglasses. A bandage contact lens may be applied after eye surgery. And contact lenses used in ortho-k or corneal refractive therapy are designed to reshape the cornea for better vision when the lens is removed.(
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Dr Boothe Cataract Surgery: Limbal relaxing incisions A surgical procedure, often performed during cataract surgery, which corrects usually mild astigmatism by flattening the curvature of the eye's clear surface (cornea). Limbal relaxing incisions are inserted at the boundary (limbus) separating the cornea from the white of the eye (sclera). By altering this portion of the eye instead of the center, surgeons are able to preserve the surface and optical qualities of the cornea.
Dr Boothe Answers Blog: * Asymmetry: one half does not match the other.
* Border: irregular or scalloped.
* Color: varies in shade or color.
* Diameter: larger than that of a pencil eraser.
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