The slit lamp exam uses an instrument that provides a magnified, three-dimensional (3-D) view of the different parts of the eye.

Slit lamp examination

Normal:

The eyelashes, eyelids, and lining of the eyelids (conjunctiva) look normal.

All of the structures inside of the eye look normal.

Abnormal:

Cataracts are seen.

Changes are found in the cornea , such as an irregularly shaped cornea or a corneal scratch (abrasion), ulcer, or infection

A foreign body, such as a metal fragment, is found.

Infection, such as iritis or conjunctivitis , is found.

Bleeding is seen between the iris and cornea (hyphema) from a sudden break in a blood vessel or as a result of an injury to the eye.

Signs of glaucoma are seen.

What Affects the Test

The inability to remain still throughout a slit lamp examination may make it hard for your doctor to check your eyes.