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Fluorescein dye is an orange diagnostic dye used in eye care to highlight changes on the eye surface. Eye doctors use it to check the cornea, tear film, and contact lens fit. It glows yellow-green under blue light, which helps reveal scratches, dry spots, and certain surface problems. Fluorescein dye is used for diagnosis, not as a treatment.
read more about fluorescein dye ...Fluorescein spreads through the tear film after it touches the eye surface. Areas where the corneal surface is disrupted can hold more dye and appear brighter under cobalt blue light. This helps the clinician see patterns that are hard to spot with normal white light. The dye can also help measure tear breakup time in dry eye evaluations.
Fluorescein dye is used during exams for corneal abrasions, foreign body checks, dry eye testing, contact lens fitting, and applanation tonometry. It can help show whether the cornea has surface damage after injury or irritation. It can also help eye doctors judge how a rigid contact lens fits on the eye. The test is quick and is commonly done during an eye exam.
Fluorescein can be applied with sterile paper strips or as an ophthalmic solution. Strips are commonly moistened with sterile saline before touching the eye surface or tear film. Drops can be used in certain clinical settings and for specific diagnostic needs. The clinician chooses the format based on the exam and the amount of dye needed.
Fluorescein can cause brief stinging, tearing, mild irritation, or temporary yellow-orange discoloration of tears. Rare allergic reactions can happen. Contact lenses should be handled according to the eye doctor's instructions because dye can stain some lenses. Eye pain, worsening redness, discharge, or vision changes after an exam should be reported promptly.
Fluorescein dye can sting briefly when placed in the eye. The feeling normally fades quickly during the exam.
Yes, fluorescein can help reveal corneal scratches or surface defects. Damaged areas can hold the dye and glow under blue light.
No, fluorescein dye does not dilate the pupil. It stains the tear film and eye surface so the clinician can examine them more clearly.
Ask the eye doctor when to put contact lenses back in. Some lenses can absorb dye or trap residue, so timing depends on the lens type and exam findings.
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Fluorescein. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK555957/. Date Accessed June 3, 2026.
Fluorescein Eye Inserts or Strips. Cleveland Clinic. https://my.clevelandclinic.org/health/drugs/18960-fluorescein-ophthalmic-insert-or-strip. Date Accessed June 3, 2026.
Fluorescein staining of the cornea. University of Iowa EyeRounds. https://webeye.ophth.uiowa.edu/eyeforum/atlas-video/fluorescein-staining.htm. Date Accessed June 3, 2026.
Label: FUL-GLO- fluorescein sodium strip. DailyMed. https://www.dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?audience=consumer&setid=88ced9b3-60af-492b-9aca-1046efed17cb. Date Accessed June 3, 2026.