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Visual acuity test
Visual acuity test


Visual field test
Visual field test


Definition:

A standard ophthalmic exam is a series of tests done to check your vision and the health of your eyes.

See also: Refraction test



Alternative Names:

Routine eye examination; Eye exam - standard; Snellen chart



How the test is performed:

The eye doctor will ask questions about your overall health and family's medical history. You should tell the doctor if you have noticed any eye problems.

The doctor checks your vision (visual acuity) using a chart of random letters of different sizes. This is called the Snellen chart.

To see inside your eye, the doctor looks through a magnifying glass that has a light on the end (an ophthalmoscope). The device allows the doctor to see the retina and nearby blood vessels, back of the eye (fundus), and optic nerve area.

Sometimes, you'll be given eye drops so that the doctor can better view the back of the eye. Another magnifying device called a slit lamp is used to see the clear surface of the eye (cornea). See: Slit-lamp exam

Different machines and methods test your eye's reaction to light, eye movement , and side (peripheral ) vision. To see if you need glasses, the doctor places several lenses in front of your eye, one at a time, and asks you when the letters on the Snellen chart are easier to see.

Color blindness is tested using multicolored dots that form numbers. See: Color vision test

The doctor checks for glaucoma using a method called tonometry .



How to prepare for the test:

Make an appointment with an eye doctor (some take walk-in patients). Avoid eye strain the day of the test. You may need someone to drive you home if the doctor uses eye drops to perform certain eye tests.



How the test will feel:

The tests cause no pain or discomfort.



Why the test is performed:

You should have regular eye exams. Such exams allow for early detection of eye problems and help determine the cause of vision changes .

Various eye and medical problems can be found by a routine eye test, including glaucoma, cataracts, high blood pressure, macular degeneration, and diabetes. People with diabetes should have their eyes examined at least once a year.

Certain types of work require that you get eye exams. For example, pilots, race car drivers, and military personnel.



Normal Values:
  • 20/20 (normal) vision
  • Ability to differentiate colors
  • No signs of glaucoma
  • Normal optic nerve, retinal vessels, and fundus


What abnormal results mean:

Abnormal results may be due to:

This list may not be all-inclusive



What the risks are:

If you received drops to dilate your eyes for the ophthalmoscopy, your vision will be blurred and sunlight can damage your eye. Wear dark glasses or shade your eyes to avoid discomfort until the dilation wears off.



Special considerations:

Many eye diseases, if detected early, are curable or can be treated.




Review Date: 2/22/2007
Reviewed By: Paul B. Griggs, MD, Department of Ophthalmology, Virginia Mason Medical Center, Seattle, WA . Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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