fluorescein ophthalmic

Action and Spectrum

Actions and Spectrum: 

fluorescein ophthalmic is a commonly used diagnostic tool in ophthalmology. It is a fluorescent dye that is administered topically to the eye to evaluate the integrity of the cornea and tear film.  

Action: 

• Staining: When applied topically, fluorescein ophthalmic stains the cornea and other ocular surfaces. It adheres to damaged or irregular areas of the cornea, highlighting epithelial defects, abrasions, ulcers, or foreign bodies. This staining allows eye care professionals to assess the health and condition of the cornea. 
• Tear film evaluation: fluorescein ophthalmic is also used to assess tear film quality and breakup time. By observing the distribution and pattern of the dye on the ocular surface, eye care professionals can evaluate tear film stability and diagnose conditions such as dry eye syndrome. 

Spectrum:  

fluorescein ophthalmic emits a greenish-yellow fluorescence when exposed to blue light. The spectrum of fluorescein ranges from approximately 465 to 490 nanometers, with a peak emission wavelength of around 520 nanometers. This fluorescence makes it easier to visualize and identify abnormalities on the ocular surface under specialized examination equipment, such as a slit lamp microscope with a blue filter or a cobalt blue light. 

Drug Interaction

Adverse Reaction

Frequency not defined 

Skin discoloration (yellow) 

Dermatitis 

Seizure 

Hypotension 

Hives 

Syncope 

Taste disturbance 

Cardiac arrest (rare) 

Thrombophlebitis 

Shock 

Basilar artery ischemia (rare) 

Bronchospasm 

Vomiting 

Pruritus GI distress 

Dizziness 

Extravasation 

Headache 

Urine discoloration 

Black Box Warning

Black Box Warning: 

None 

Contraindication / Caution

Contraindication/Caution: 

Contraindication 

• Hypersensitivity: Individuals with known hypersensitivity or allergic reaction to fluorescein or its components should avoid its use. Allergic reactions can vary from mild skin irritation to more severe reactions, like the difficulty breathing or anaphylaxis. If you have a history of hypersensitivity or allergies, it is crucial to inform your eye care professional before receiving fluorescein ophthalmic. 
• Pregnancy and breastfeeding: The safety of fluorescein ophthalmic use during pregnancy and breastfeeding has not been well established. As a precautionary measure, avoiding its use in these situations is generally recommended unless the potential benefits outweigh the potential risks. Consult your healthcare provider and eye care professional if pregnant or breastfeeding. 
• Contact lens wearers: fluorescein ophthalmic should not be used while wearing contact lenses. Contact lenses should be generally removed before applying the dye, as they can absorb and retain it, leading to prolonged staining and potential complications. It is generally recommended to wait at least 15 minutes after dye administration before reinserting contact lenses. 
• Corneal abrasions or ulcerations: fluorescein ophthalmic is typically used to identify and evaluate corneal defects. However, caution should be exercised when using it in cases of significant corneal abrasions or ulcerations, as the dye can cause discomfort and potentially worsen the condition. In such cases, your eye care professional will determine the appropriate action. 

Caution 

• Eye irritation: fluorescein ophthalmic can cause mild irritation or discomfort in some individuals. This can manifest as a stinging or burning sensation in the eye. If you experience significant discomfort or persistent irritation after the administration of fluorescein, you should inform your eye care professional. 
• Allergic reactions: Although rare, some individuals may experience an allergic reaction to fluorescein ophthalmic. Signs of an allergic reactions may include itching, redness, swelling, or hives. If you develop any symptoms after receiving fluorescein, seek immediate medical attention. 
• Transient discoloration: fluorescein ophthalmic can temporarily discolor the skin and other tissues that come into contact with the dye. This includes the conjunctiva, eyelids, and sometimes the sclera (white part of the eye). The discoloration usually resolves over time, but informing your eye care professional of any concerns is essential. 
• False positives: In certain situations, such as severe corneal edema or opacification, the interpretation of fluorescein staining can be challenging. These conditions may produce false-positive results, leading to an inaccurate diagnosis. Your eye care professional will consider the clinical context and other examination findings to minimize the potential for misinterpretation. 
• Equipment precautions: Appropriate examination equipment, such as a slit lamp microscope with a blue filter or a cobalt blue light, is crucial for accurately visualizing and interpreting fluorescein staining. Eye care professionals should ensure the equipment is calibrated correctly and functioning to obtain reliable results. 

Pregnancy / Lactation

Pregnancy consideration:  

US FDA pregnancy category: Not assigned. 

Lactation:   

Excreted into human milk: Yes. 

Pregnancy category: 

• Category A: well-controlled and Satisfactory studies show no risk to the fetus in the first or later trimester. 
• Category B: there was no evidence of risk to the fetus in animal studies, and there were not enough studies on pregnant women. 
• Category C: there was evidence of risk of adverse effects in animal reproduction studies, and no adequate evidence in human studies must take care of potential risks in pregnant women.    
• Category D: adequate data with sufficient evidence of human fetal risk from various platforms, but despite the potential risk, and used only in emergency cases for potential benefits.    
• Category X: Drugs listed in this category outweigh the risks over benefits. Hence these categories of drugs need to be avoided by pregnant women.    
• Category N: There is no data available for the drug under this category 

Pharmacology

Pharmacology: 

fluorescein ophthalmic is a diagnostic tool used in ophthalmology that functions as a fluorescent dye. It is administered topically to the eye and selectively binds to damaged or irregular areas of the cornea and other ocular surfaces.

The dye fluoresces when exposed to blue light, emitting a greenish-yellow glow, allowing eye care professionals to visualize and evaluate corneal defects, abrasions, ulcers, foreign bodies, and the integrity of the tear film.

fluorescein ophthalmic has a relatively short duration of action and is eliminated through tear flow and renal excretion. Its pharmacological action is based on its staining properties and fluorescence emission, enabling clinicians to assess ocular conditions and make informed diagnostic and treatment decisions. 

Pharmacodynamics: 

Mechanism of action: The mechanism of action of fluorescein ophthalmic is primarily based on its staining properties and fluorescence.  

• Staining: fluorescein ophthalmic selectively stains damaged or irregular areas of the ocular surface, particularly the cornea. When applied topically, the dye adheres to epithelial defects, abrasions, ulcers, or other abnormalities on the cornea, making them more visible for examination. It highlights areas of compromised integrity and provides valuable information for diagnostic purposes. 
• Fluorescence: fluorescein ophthalmic exhibits fluorescence when exposed to blue light. The dye absorbs the blue light and emits a greenish-yellow fluorescence in response. This fluorescence enables eye care professionals to visualize and quickly identify the stained areas on the ocular surface. Specialized examination equipment, such as a slit lamp microscope with a blue filter or a cobalt blue light, is used to observe and capture the emitted fluorescence. 

Pharmacokinetics: 

Absorption 

fluorescein ophthalmic is primarily absorbed through the ocular surface, including the cornea and conjunctiva. The dye quickly permeates the corneal epithelium and reaches the eye’s anterior chamber. 

Distribution 

Once absorbed, fluorescein rapidly distributes throughout the aqueous humor, reaching various ocular structures. It can stain damaged or irregular areas of the cornea and other ocular surfaces. 

Metabolism 

fluorescein is not significantly metabolized in the body. It remains in its original form and does not undergo substantial biotransformation. 

Elimination and Excretion 

Excretion of fluorescein occurs through two main routes. The dye is primarily eliminated from the body via renal excretion. After absorption, fluorescein appears in the bloodstream and is filtered by the kidneys, leading to its excretion in urine. 

Adminstartion

Administration: 

Ophthalmic administration 

The administration of fluorescein ophthalmic is typically performed by an eye care professional, like an ophthalmologist or optometrist.  

• Preparation: The eye care professional will ensure the patient’s eye is free from foreign particles, debris, or excessive discharge. They may use a saline solution or eye drops to rinse the eye before administering fluorescein. 
• Instillation: fluorescein ophthalmic is usually available as eye drops or pre-soaked sterile strips. The eye care professional will apply a small amount of the dye, typically 1-2 drops, onto the conjunctival sac of the lower eyelid. Alternatively, they may place a pre-soaked strip gently against the inferior fornix (the pocket between the lower eyelid and the eye). 
• Blinking and distribution: The patient will be instructed to blink a few times to help distribute the fluorescein dye across the eye’s surface. The dye will naturally spread over the cornea and adhere to any irregularities or defects. 
• Examination: The eye care professional will use specialized examination equipment, such as a slit lamp microscope with a blue filter or a cobalt blue light, to observe and evaluate the fluorescein staining pattern. They may also use a magnifying lens or other diagnostic tools to examine the eye in detail. 
• Interpretation: The eye care professional will interpret the staining pattern and the presence of any abnormalities on the ocular surface. They will assess the integrity of the cornea and identify epithelial defects, abrasions, ulcers, or other conditions that may be present. This evaluation will help guide diagnosis and treatment decisions. 

Patient Information Leaflet

Patient information leaflet 

Generic Name: fluorescein ophthalmic 

Why do we use fluorescein ophthalmic? 

fluorescein ophthalmic has several essential uses in ophthalmology for diagnostic and evaluation purposes.  

• Corneal Abrasions and Ulcers: fluorescein ophthalmic is widely used to detect and assess corneal abrasions and ulcers. When applied to the eye, the dye adheres to the damaged areas of the cornea, making them visible under specialized examination equipment. This helps eye care professionals evaluate the corneal defect’s size, depth, and location. 
• Foreign Body Detection: fluorescein ophthalmic can assist in locating foreign bodies, such as small particles or objects that may be embedded on the eye’s surface or within the cornea. The dye adheres to the foreign body, making identifying and determining the appropriate treatment approach easier. 
• Dry Eye Evaluation: It is used to evaluate tear film quality and breakup time, particularly in cases of dry eye syndrome. The dye is used to assess tear film stability by observing the distribution and pattern of the dye on the ocular surface. This helps in diagnosing and managing dry eye conditions. 
• Contact Lens Fitting: fluorescein ophthalmic is commonly used during contact lens fitting examinations. The dye can assist in evaluating the fitting of contact lenses on the cornea. It can highlight poor lens-to-cornea fit areas or identify tight or loose spots that may affect comfort and vision. 
• Corneal Disease Assessment: fluorescein ophthalmic is valuable for evaluating corneal diseases, such as corneal dystrophies, erosions, and keratitis. It aids in identifying areas of compromised corneal integrity and assesses the disease process’s extent. 
• Intraocular Foreign Body Detection: In some instances, fluorescein ophthalmic can be combined with special diagnostic techniques to identify intraocular foreign bodies. The dye may be injected systemically, and under specific lighting conditions, it can reveal the presence of foreign bodies within the eye.