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The slit-lamp examination looks at structures that are at the front of the eye.
How the Test is Performed
The slit-lamp is a low-power microscope combined with a high-intensity light source that can be focused to shine in a thin beam.
You will sit in a chair with the instrument placed in front of you. You will be asked to rest your chin and forehead on a support to keep your head steady.
The health care provider will examine your eyes, especially the eyelids, cornea, conjunctiva, sclera, and iris. Often a yellow dye (fluorescein) is used to help examine the cornea and tear layer. The dye is either added as a drop, or the health care provider may touch a fine strip of paper stained with the dye to the white of your eye. The dye rinses out of the eye with tears as you blink.
Next, drops may be placed in your eyes to widen (dilate) your pupils. The drops take about 15 to 20 minutes to work. The slit-lamp examination is then repeated using another small lens held close to the eye, so the back of the eye can be examined.
How to Prepare for the Test
No special preparation is necessary for this test.
How the Test Will Feel
Your eyes will be sensitive to light for a few hours after the exam if dilating drops are used.
Why the Test is Performed
This test is used to examine the:
Structures in the eye are found to be normal.
What Abnormal Results Mean
The slit lamp exam may detect many diseases of the eye, including:
- Corneal injury
- Dry eye syndrome
- Macular degeneration
- Retinal detachment
- Retinal vessel occlusion
- Retinitis pigmentosa
This list does not include all possible diseases of the eye.
The dilating drops may cause increased pressure in the eye with nausea and pain. This is very rare, but you should IMMEDIATELY return to your doctor's office if you experience either of these symptoms.
Fellman RL, Spaeth GL. Gonioscopy. In: Tasman W, Jaeger EA, eds. Duane's Ophthalmology. 15th ed. Philadelphia, Pa: Lippincott Williams & Wilkins; 2009:chap 44.
Colenbrander A. Principles of Ophthalmology. In: Tasman W, Jaeger EA, eds. Duane's Ophthalmology. 15th ed. Philadelphia, Pa: Lippincott Williams & Wilkins; 2009:chap 63.
American Academy of Ophthalmology Preferred Practice Patterns Committee: Preferred Practice Pattern Guidelines. Comprehensive Adult Medical Eye Evaluation. San Francisco, CA: American Academy of Ophthalmology, 2010. Accessed January 17, 2011.
Miller D, Thall EH, Atebara NH. Ophtalmic instrumentation. In: Yanoff M, Duker JS, eds. Ophthalmology. 3rd ed. St. Louis, MO: Mosby Elsevier;2008:chap 2.10.
Reviewed By: Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington School of Medicine; and Franklin W. Lusby, MD, Ophthalmologist, Lusby Vision Institute, La Jolla, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.