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Eye Term Glossary

Ultrasonic procedure to measure specific areas within the eye.

The clarity of vision, usually measured on a chart.

A warping of the curvature of the cornea so that light rays entering the eye do not meet in a single focal point, resulting in a distorted image.

Ultrasonic procedure used to check for abnormalities or locate foreign bodies within the eye.

A disease which causes the lens or its capsule to become opaque.  It can result in partially or severely decreased vision, but is usually removable and vision correctable by use of an implant.

The clear front surface of the eye which covers the iris and pupil.  Acts like the lens of a camera.

A unit of measure of the refractive power of a lens, equal to the power of a lens with a focal distance of one meter.

Photography of the back of the eye after the injection of fluorescein dye into the bloodstream.

A disease that damages the optic nerve, characterized by increased pressure within the eyeball, leading to a gradual vision impairment, and sometimes, blindness if not diagnosed and treated.

Farsightedness; a condition in which light rays are focused behind the retina so that distant objects are seen more clearly than near ones.

Intraocular lens (IOL) is a lens implanted in the eye as part of a treatment for cataracts or myopia. The most common type of IOL is the pseudophakic IOL. These are implanted during cataract surgery, after the cloudy eye’s natural lens (colloquially called a cataract) has been removed.
Reference: Wikipedia

Surgery to replace a cloudy lens (cataract) with a new, clear artificial lens designed to eliminate the need for very thick, heavy glasses.  This is usually done at the time of the cataract extraction, but may be done later as a secondary implant. 

The measurement of the curvature of the cornea.

Lasik is an FDA-approved procedure that corrects nearsightedness, farsightedness, and astigmatism in a patient, instantly allowing them to see clearly without the aid of eyeglasses or contact lenses. 

The part of the eye between the iris and the vitreous humor, which helps to focus light rays entering the pupil on the retina.

Nearsightedness; a condition in which light rays from distant objects are focused in front of the retina instead of on it, so that distant objects are not seen clearly.

A pachymeter is a medical device used to measure the thickness of the eye’s cornea. It is used to perform corneal pachymetry prior to refractive surgery, for Keratoconus screening, LRI surgery and is useful in screening for patients suspected of developing glaucoma among other uses. 

Reference – Wikipedia

 A form of farsightedness occurring during middle age, caused by a diminished elasticity of the lens.

PRK (photorefractive keratectomy) is a type of refractive surgery to correct myopia (nearsightedness), hyperopia (farsightedness) and astigmatism. PRK was the first type of laser eye surgery for vision correction and is the predecessor to the popular LASIK procedure.

Eye problems which can be corrected through glasses, contact lenses, or, in some cases, surgery.

A layer of cells at the back of the eye which are sensitive to light and upon which the image formed by the lens is focused.  The image is then carried to the brain by the optic nerve.

 If no lens was placed in the eye at the time of the initial cataract removal surgery, then a secondary procedure to implant the lens may be done months or years later.

 A microscope using various magnifications combined with a strong light that can be focused into a slit for examining the eye.

The measurement of the tension or pressure inside the eyeball.

 A procedure using sound waves to measure certain portions or detect abnormalities within the eye.