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Fluorescein Eye Stain Test
Published on January 23rd, 2026
A Fluorescein Eye Stain Test is undertaken to show potential problems with the front of the eye when viewed under cobalt blue light, such as corneal abrasions, ulcers or foreign bodies present, according to The Royal Children's Hospital Melbourne. The test is important for an eye doctor to conduct if they suspect you have any damage to the front of the eye. They will be able to assess how serious the damage is and treat it accordingly. Read on for more on how the Fluorescein Eye Stain Test is undertaken and what it entails.
What is a Fluorescein Eye Stain Test?
A fluorescein eye stain test refers to a process wherein eye drops or a paper strip containing fluorescein dye stains the tear film of the eye, according to Colin Clement Eye Doctor. Blue light will be shone on the eye, and any corneal problems, such as abrasions and cuts, will appear fluorescent green under the light.
What Does Eye Stain Mean in an Eye Test?
The eye stain in a Fluorescein Eye Stain Test refers to the liquid dye pooling in areas of damage or irritation on the front of the eye. The dye appears green when shone under blue light, indicating any problems when the eye test is conducted.
Why Do Eye Doctors Use Fluorescein Dye During Eye Tests?
Eye doctors use fluorescein dye during the eye test, and based on the staining, your doctor can identify any problems, such as foreign bodies in your cornea. The dye is placed on the outer surface of the eye by your eye doctor.
Is Fluorescein an Eye Dye Used to Diagnose Eye Conditions?
Yes, Fluorescence staining is just one of many tests that an optometrist can do to help diagnose any problems at the front of the eye, such as lodged foreign bodies, scratches, dryness or signs of systemic disease.
Can Fluorescein Eye Tests Affect Wearing Glasses After the Exam?
Fluorescein eye tests should not generally affect the feeling of wearing glasses after the exam. Your glasses or contacts will need to be removed during the process; you should be able to resume wearing them after the test has been administered unless your optometrist advises otherwise.
What Is Fluorescein Staining Used For?
Fluorescein staining is used to diagnose abnormalities of structures at the front of the eye, such as the cornea, conjunctiva and lids, according to Healthline. These abnormalities include corneal scratches, ulcers, and dry eyes. Read more about these abnormalities and how fluorescein staining is used for detecting them, below.
- Corneal Scratches: Corneal scratches are detected with Fluorescein staining, which can occur when the cornea has come into contact with foreign objects that have scratched the eye surface.
- Ulcers: An ulcer on the cornea is a painful, open sore on the outer layer of the cornea. Fluorescein staining can detect the presence of corneal ulcers.
- Dry Eyes: Dry eyes can be identified through Fluorescein staining either caused by abnormal tear production or severe dry eye associated with arthritis.
What Eye Conditions Can Fluorescein Staining Detect?
The eye conditions that fluorescein staining can detect include; corneal abrasions, punctures, dryness, allergies, infections and signs of systemic issues, just as autoimmune and degenerative diseases.
How Does Fluorescein Staining Highlight Corneal Damage?
Fluorescein staining highlights corneal damage through its use of a special dye (fluorescein) that is typically orange and sticks to absent or damaged epithelial cells.
Should You Avoid Contact Lenses After Fluorescein Staining?
Yes, it is best to avoid contact lenses after Fluorescein staining. There may be residual orange dye on the surface of your eye, which could stain the contacts; this will not affect the clarity of your vision.
What Is the Procedure for Performing a Fluorescein Eye Stain Test?
The procedure for performing a fluorescein eye stain test involves the eye doctor applying fluorescein dye through eye drops or a paper strip. This will stain the tear film of the eye orange. Once a blue light is immediately overlayed, issues such as abrasions, foreign objects or infections may be seen by a green glow.
What Types of Corneal Damage Can the Fluorescein Eye Stain Test Detect?
The types of corneal damage that the Fluorescein eye stain test can detect include corneal abrasions, ulcers, the presence of foreign bodies, dry eyes, or corneal infections.
Is the Fluorescein Eye Stain Test Painful or Uncomfortable?
No, the fluorescein eye stain test should not be painful or uncomfortable. You might feel a slight stinging when the drops are applied, but it shouldn't last too long or feel excessively painful.
Do Sunglasses Help Reduce Light Sensitivity After an Eye Stain Test?
Yes, sunglasses help reduce light sensitivity after an eye stain test. This is not critical as post-dye light sensitivity is generally rare and mild. Sunglasses under the Australian/New Zealand Standards must block UV rays up to 400 nanometres (nm) in wavelength. This makes them an essential accessory to reduce light sensitivity.
How Long Does Fluorescein Eye Stain Last?
Fluorescein eye stains generally last a few minutes on the front of the eye. Any dye that has spilled onto the lids can linger, however easily wiped off with a wet towel or tissue.
How Long Does Fluorescein Eye Stain Last on Contact Lenses?
The Fluorescein eye stain should not be present on contact lenses. Patients will be asked to remove contact lenses if they wear them before they take the fluorescein eye stain test.
Why Do Tears Appear Yellow or Orange After the Test?
Your tears may appear yellow or orange after the Fluorescein Eye Stain Test due to residual orange dye present in your tear film after the test. It should be completely gone after an hour or two.
What Does a Positive Fluorescein Eye Stain Mean?
A positive Fluorescein eye stain will mean there may be problems present at the front surface of the eye, which will appear glowing green under the blue light. These problems include corneal abrasions, foreign bodies present, dryness, allergies or infections.
What Does Abnormal Fluorescein Uptake Indicate?
An abnormal fluorescein uptake can indicate dry eyes, blocked tear ducts, corneal abrasions, infection or the presence of foreign bodies.
What is a Normal Fluorescein Eye Stain Result?
A normal fluorescein eye stain result will occur if the structures at the front of the eye are undamaged. The dye will appear smoothly covering the entire surface of your eye, according to Healthline.
Can Fluorescein Stain Results Change Over Time?
Yes, fluorescein stain results can change over time, which can affect the way they are analysed and viewed. Fluorescein is best observed 1-2 minutes after it is applied to the eye surface, according to the Review of Cornea & Contact Lenses.
What Does a Corneal Abrasion Look Like Under Fluorescein?
A corneal abrasion can look like a glowing green line or patch when dyed with fluorescein and under cobalt blue light.
How Does Fluorescein Detect Corneal Abrasions?
Fluorescein can detect corneal abrasions by temporarily adhering and pooling in damaged tissue. It is an orange dye that glows green in the wound when shone with cobalt blue light. This can help eye care professionals examine whether you have a damaged or abnormal corneal surface.
Can Fluorescein Staining Detect Corneal Ulcers or Infections?
Yes, fluorescein staining can detect corneal ulcers or infections. It is a common method used by eye doctors to see whether a patient has these corneal problems.
Is Fluorescein Eye Staining Used for Dry Eye Diagnosis?
Yes, fluorescein eye staining can be used for dry eye diagnosis, as well as showing other corneal problems that may be present, such as ulcers and foreign bodies.
What Are the Side Effects of Fluorescein Eye Stain?
Although rare, side effects of Fluorescein eye stain include eye irritation or skin rashes, according to Retina Specialist Victoria. It should be noted that the possibility of these side effects is extremely unlikely with topical use. Eye irritation may occur with redness, irritation in the surrounding area and swelling. Skin rashes with raised blotches may occur as a result of the Fluorescein eye stain.
What Eye Irritation or Allergic Reactions Can Occur with Fluorescein Use?
There should be no severe eye irritation or allergic reactions that occur with fluorescein use for an eye stain test. You may experience a scratchy sensation on the blotting paper if you have dry eyes. The dye may also cause a mild and brief stinging sensation; most people feel nothing at all, according to Medline Plus.
Are Fluorescein Eye Drops Safe?
Yes, fluorescein eye drops are generally safe. However, you may feel a scratchy sensation or a mild and brief stinging sensation when the drops are put in. More severe side effects from fluorocine dye are extremely rare.
How Is Fluorescein Eye Staining Used in Children?
The fluorescein eye stain is used in children the same way as it is for adults. According to the Benioff Children's Hospital, a piece of blotting paper containing the dye is touched to the surface of your eye or administered in a drop form which also contains an anesthetic. The child will be asked to blink as this spreads the dye and coats the tear film covering the surface of the cornea. The eye doctor then shines a blue light at your eye, where any problems on the surface of the cornea will be stained by the dye and appear green under the blue light. This eye staining for children is safe and effective for detecting corneal abrasions.
How is Fluorescein Eye Stain Used in Dogs or Cats?
The fluorescein eye stain is used in dogs or cats the same way as it is in humans. A fluorescein corneal stain is an important and common test in veterinary ophthalmology as it detects scratches, ulcers, foreign bodies and other surface damage to the eye, according to the Southern Ocean Animal Hospital.
Is Fluorescein Eye Stain Safe for Children?
Yes, fluorescein eye stain is safe for children. It is a common method used to expose potentially anterior eye problems.
How Much Does a Fluorescein Eye Stain Test Cost?
Eye examinations that involve the use of fluorescein dye will depend on whether the patient is covered by Medicare or not. Fluorescein eye stain tests are part of a regular bulk billed eye exam under Medicare, which means patients who have a valid Medicare card do not need to pay any extra expense to cover it. However, if a patient does not have Medicare, the test may incur a cost that can vary between each clinic.