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Ency. home > Test > F > Fluorescein eye stain

Fluorescein eye stain   

Overview | Risks | Results

Alternative names:

Fluorescein staining of the tear film

Definition:

An eye test that uses an orange dye (fluorescein) and a cobalt blue light to detect foreign bodies in the eye or damage to the corneal surface.

How the Test is Performed

Dye is placed in the eye, using blotting paper impregnated with fluorescein dye, where it stains the tear film which covers the surface of the cornea. The individual is asked to blink to move the dye. A blue light is then directed on the eye, causing the fluorescein to glow green. Abnormalities in the surface of the eye will cause the dye to stain that region.

The ophthalmologist or optometrist (eye doctor) can determine the location and probable cause of the cornea problem depending on the size, location, and shape of the staining.

How to Prepare for the Test

If contact lenses are worn, they will need to be removed before the test.

Infants and children:
The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experiences, and level of trust. For specific information regarding how you can prepare your child, see the following topics as they correspond to your child's age:

How the Test will Feel

If eyes are extremely dry, the blotting paper may be slightly scratchy. The dye may cause a mild and brief stinging sensation.

Why the Test is Performed

This test is useful in superficial scratches or other problems with the surface of the cornea. It can also help reveal foreign bodies on the eye surface. It can be used after contacts are prescribed to determine if there is irritation of the surface of the cornea.

Ency. home > Test > F > Fluorescein eye stain

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