Chapter 13 Eye Diagnostic Procedures

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keratometer

An instrument used to measure the curvature of the cornea.

Fluorescein staining

Applying dye eye drops that are a bright green fluorescent color. Used to look for corneal abrasions or ulcers.

Snellen chart

Chart used for testing distance vision named for Dutch ophthalmologist Hermann Snellen. It contains letters of varying size and is administered from a distance of 20 feet. A person who can read at 20 feet what the average person can read at this distance is said to have 20/20 vision.

ophthalmoscopy

Examination of the interior of the eyes using an instrument called an ophthalmoscope. The physician dilates the pupil in order to see the cornea, lens, and retina. Used to identify abnormalities in the blood vessels of the eye and some systemic diseases.

Slit lamp microscopy

Examining the conjunctiva, cornea, iris, and lens of the eye.

ophthalmoscope

Instrument used to examine the inside of the eye through the pupil.

optometer

Instrument used to measure how well the eye is able to focus images clearly on the retina.

keratometry

Measurement of the curvature of the cornea using an instrument called a keratometer.

tonometry

Measurement of the intraocular pressure of the eye using a tonometer to check for the condition of glaucoma. Generally part of a normal eye exam for adults.

Visual acuity (VA) test

Measurement of the sharpness of a patient's vision. Usually, a Snellen chart is used for this test in which the patient identifies letters from a distance of 20 feet.

Fluorescein angiography

Process of injecting a dye (fluorescein) to observe the movement of blood and detect lesions in the macular area of the retina. Used to determine if there is a detachment of the retina.

Color vision tests

Use of polychromic (multicolored) charts to determine the ability of the patient to recognize color.

Refractive error test

Vision test for a defect in the ability of the eye to accurately focus the image that is hitting it. Refractive errors result in myopia and hyperopia.


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