The slit-lamp examination looks at structures that are at the front of the eye.

The test is used to examine the eyelids, the sclera, conjunctiva, iris, lens, and the cornea.

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 and may touch a fine strip of paper stained with an orange-colored dye (fluorescein) to the side of your eye. The dye stains the tear film on the surface of the eye to help with the examination. The dye rinses out of the eye with tears.

After this examination, drops may be placed in your eyes to dilate the pupils. The drops take about 15 to 20 minutes to work. The examination is then repeated, allowing the back of the eye to be examined.

No special preparation is necessary for this test.

Your eyes will be sensitive to light for a few hours after the exam if dilating drops are used.