Celluvisc

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Celluvisc on Prescriptsy

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Celluvisc is a preservative-free artificial tear solution containing carmellose sodium, available in two concentrations (0.5% and 1%) in single-dose units.

It is used for the symptomatic relief of dry eye syndrome, one of the most common ophthalmic conditions encountered in clinical practice, affecting an estimated 15 to 33% of the adult population worldwide, with prevalence increasing with age.

In the United Kingdom, dry eye accounts for a significant proportion of optometry and ophthalmology consultations and is a leading reason for over-the-counter eye drop purchases.

Celluvisc works by supplementing and stabilising the natural tear film, providing lubrication and protection to the corneal and conjunctival surfaces.

Its preservative-free formulation makes it particularly suitable for patients who require frequent application, those with moderate to severe dry eye, contact lens wearers, and patients with pre-existing ocular surface disease.

This page provides a comprehensive clinical overview of how Celluvisc works, correct use, what to expect, side effects, and how to obtain this product in the UK.

Important safety information about Celluvisc

Before reading further, note the following safety points about Celluvisc.

• Celluvisc is for use in the eye only. Do not swallow or inject.
• Each single-dose unit is for one-time use only. Discard any remaining solution after application.
• If you experience significant eye pain, sudden visual changes, or symptoms that worsen despite regular use of artificial tears, seek medical advice promptly, as these may indicate a more serious condition.
• Temporary blurred vision may occur after instillation, particularly with the 1% formulation. Do not drive until your vision has cleared.

Understanding dry eye syndrome

The tear film is a thin layer of fluid that covers the exposed surface of the eye.

It has three functional components: an outer lipid (oily) layer produced by the meibomian glands in the eyelids, which slows tear evaporation; a middle aqueous (watery) layer produced by the lacrimal glands, which provides moisture, oxygen, and nutrients to the cornea; and an inner mucin layer produced by conjunctival goblet cells, which allows the aqueous layer to spread evenly across the corneal surface.

Dry eye syndrome (also called dry eye disease or keratoconjunctivitis sicca) occurs when the tear film is quantitatively insufficient (aqueous-deficient dry eye) or qualitatively abnormal (evaporative dry eye), or most commonly a combination of both.

The resulting tear film instability leads to increased tear osmolarity, inflammation of the ocular surface, and damage to the corneal and conjunctival epithelium.

Symptoms of dry eye

Common symptoms include a persistent sensation of dryness, grittiness or sandiness in the eyes, burning or stinging, irritation, foreign body sensation, excessive tearing (paradoxical reflex tearing in response to ocular surface irritation), intermittent blurred vision (that clears with blinking), redness, and tired or heavy-feeling eyes.

Symptoms are often worse in dry, windy, or air-conditioned environments, during prolonged screen use or reading (when blink rate decreases), and towards the end of the day.

Causes and risk factors

Dry eye is multifactorial.

Major risk factors include ageing (tear production declines with age), female sex (hormonal changes during menopause, pregnancy, and oral contraceptive use increase risk), prolonged use of digital screens (reduced blink rate), air-conditioned, heated, or low-humidity environments, contact lens wear, certain systemic medications (antihistamines, decongestants, antidepressants, beta-blockers, diuretics, oral contraceptives, isotretinoin), autoimmune diseases (Sjogren syndrome, rheumatoid arthritis, systemic lupus erythematosus), thyroid eye disease, previous eye surgery (LASIK, cataract surgery), meibomian gland dysfunction, and eyelid abnormalities (entropion, ectropion, incomplete lid closure).

How Celluvisc works

Carmellose sodium (also known as carboxymethylcellulose or CMC) is a water-soluble, cellulose-derived polymer that has been used in ophthalmic practice for decades as a tear substitute and ocular lubricant.

When instilled into the eye, carmellose forms a clear, viscoelastic film over the corneal and conjunctival epithelium that mimics several functions of the natural tear film.

The carmellose polymer binds to the ocular surface mucin layer and to exposed epithelial cells, creating a stable, hydrated coating that reduces friction between the eyelid and the globe during blinking, protects damaged or desiccated epithelial cells from further mechanical and environmental insult, retains moisture on the ocular surface by increasing tear film break-up time, and reduces tear osmolarity by diluting the hyperosmolar tear film.

Celluvisc 0.5% has a lower viscosity and is generally preferred for mild to moderate dry eye symptoms, for patients who dislike the temporary blurring associated with more viscous drops, and for use with soft contact lenses.

Celluvisc 1% has a higher viscosity that provides longer ocular surface residence time and more sustained lubrication, making it more suitable for moderate to severe dry eye, though it may cause more transient blurring on instillation.

Preservative-free advantage

Many multi-dose eye drop bottles contain preservatives, most commonly benzalkonium chloride (BAK), to prevent microbial contamination after opening.

BAK is a detergent-type preservative that disrupts the lipid layer of the tear film and is directly toxic to corneal and conjunctival epithelial cells with repeated exposure.

Patients who use preserved artificial tears more than 4 to 6 times daily, or who have pre-existing ocular surface disease, are at risk of preservative-induced ocular surface toxicity, which can paradoxically worsen dry eye symptoms.

Celluvisc avoids this problem entirely by using preservative-free single-dose units. Each unit is manufactured under sterile conditions, sealed, and intended for one-time use.

This design eliminates the need for a preservative and ensures that each application delivers a sterile, uncontaminated dose.

The TFOS DEWS II (Tear Film and Ocular Surface Society Dry Eye Workshop) guidelines recommend preservative-free formulations for patients requiring artificial tears more than 4 times daily.

Clinical evidence for carmellose sodium

Carmellose sodium is one of the most extensively studied artificial tear ingredients.

Randomised controlled trials have demonstrated that CMC-based artificial tears significantly improve dry eye symptoms (assessed by visual analogue scales and validated questionnaires such as the Ocular Surface Disease Index), increase tear film break-up time, reduce corneal staining scores (a measure of epithelial damage), and improve contrast sensitivity.

Higher-viscosity CMC formulations provide longer symptom relief per application but may cause more temporary visual blurring.

A systematic review and network meta-analysis published in the British Journal of Ophthalmology compared various artificial tear formulations and found carmellose sodium to be among the most effective ingredients for improving dry eye symptoms and signs.

The preservative-free unit-dose format has been shown to cause less ocular surface toxicity than preserved multi-dose equivalents in patients requiring frequent daily application.

Dosage and administration

Celluvisc is administered topically to the eye. The recommended dose is one to two drops into the affected eye(s) as needed.

Most patients find 3 to 6 applications daily sufficient for symptom control, although more frequent use is permissible in severe cases. There is no maximum daily frequency.

Step-by-step administration guide

1. Wash your hands thoroughly with soap and water.
2. Separate one single-dose unit from the strip. Twist off the tab to open.
3. Tilt your head back or lie down and look up towards the ceiling.
4. With your free hand, gently pull the lower eyelid downward to create a small pocket.
5. Hold the unit above the eye without touching the dropper tip to any surface.
6. Squeeze gently to release one or two drops into the lower eyelid pocket.
7. Close your eyes gently for 30 seconds to 1 minute. Avoid blinking hard.
8. Discard the used unit, even if solution remains.

If using other eye drops, allow at least 5 minutes between products. Apply Celluvisc last if it is the most viscous product in your regimen. Apply eye ointments after all drops.

Side effects of Celluvisc

Common effects

The most commonly experienced effect is temporary blurred vision after instillation, particularly with the 1% formulation.

A sticky or filmy sensation over the eyes and mild stinging on application are also frequently reported. These effects are transient and resolve within minutes.

Uncommon effects

Ocular redness, eye discomfort, excessive tearing, lid crusting, and a foreign body sensation have been reported uncommonly. These are typically self-limiting.

Allergic reactions to carmellose sodium are very rare but may manifest as persistent redness, swelling, itching, or periorbital rash.

Discontinue use and seek advice if an allergic reaction is suspected.

When to seek medical advice

Contact your GP, optometrist, or ophthalmologist if your symptoms worsen despite regular use, if you develop significant eye pain, photophobia, visual loss, or unusual discharge.

These may indicate a condition beyond simple dry eye. Call 999 or attend A&E if you experience sudden, severe eye pain with visual loss.

Report any suspected adverse reactions via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk .

Warnings and precautions

When artificial tears are not enough

Celluvisc provides symptomatic relief but does not treat the underlying cause of dry eye disease.

If symptoms are severe, persistent, or progressive despite regular use of artificial tears, further investigation may be needed.

Your optometrist or ophthalmologist may recommend additional treatments such as anti-inflammatory eye drops (ciclosporin), punctal plugs (to reduce tear drainage), intense pulsed light therapy for meibomian gland dysfunction, or systemic treatment if an autoimmune condition is identified.

NICE recommends referral to ophthalmology for dry eye that is resistant to first-line management.

Contact lens considerations

Celluvisc 0.5% is compatible with soft contact lenses and can be instilled while lenses are worn. Celluvisc 1% should not be used while wearing contact lenses.

The higher viscosity can deposit on the lens surface, impairing vision and comfort.

Remove lenses before instilling the 1% formulation and wait at least 15 minutes before reinserting them. If you wear rigid gas-permeable lenses, consult your optometrist for specific advice.

Pregnancy and breastfeeding

Celluvisc is considered safe during pregnancy and breastfeeding. Carmellose sodium is not absorbed systemically when applied to the eye and therefore poses no risk to the developing baby or nursing infant.

How to get Celluvisc in the UK

Celluvisc is classified as a pharmacy medicine (P) in the UK and can be purchased from pharmacies without a prescription.

It is also available on NHS prescription for patients with a diagnosed dry eye condition, and your GP or optometrist can issue a prescription for long-term use.

NHS prescriptions may be particularly beneficial for patients who use Celluvisc frequently, as the cost of regular over-the-counter purchases can accumulate.

The standard NHS prescription charge in England is currently 9.90 pounds per item; prescriptions are free in Scotland, Wales, and Northern Ireland.

Generic carmellose sodium single-dose eye drops are available from several manufacturers and may be dispensed as a cost-effective alternative to the Celluvisc brand.

Your pharmacist will advise on available options. All products meeting UK pharmaceutical standards contain the same active ingredient at the same concentration.

Living with dry eye: practical management tips

In addition to using Celluvisc, the following measures can help manage dry eye symptoms and reduce their impact on daily life.

Take regular breaks during screen use (follow the 20-20-20 rule: every 20 minutes, look at something 20 feet away for 20 seconds).

Use a humidifier in rooms with central heating or air conditioning. Avoid direct airflow from fans, heaters, or car vents onto your face.

Wear wraparound sunglasses outdoors in windy or dusty conditions.

Increase your dietary intake of omega-3 fatty acids (from oily fish, flaxseed, or supplements), which may improve meibomian gland function.

Practise lid hygiene: apply a warm compress to closed eyelids for 5 to 10 minutes daily, followed by gentle lid massage to express meibomian gland secretions.

Keep well hydrated by drinking adequate fluids throughout the day.

If you spend long hours working at a computer, position your screen slightly below eye level to reduce the exposed surface area of the eye and minimise evaporation.

Consider using a larger font size or adjusting screen brightness to reduce eye strain.

When to seek urgent medical advice

Whilst dry eye is rarely a medical emergency, certain symptoms warrant urgent assessment.

Contact your optometrist, GP, or call NHS 111 if you develop significant worsening of symptoms, severe eye pain, photophobia (sensitivity to light), a marked reduction in vision, or persistent redness and discharge that does not respond to artificial tears.

These symptoms may indicate corneal ulceration, keratitis, uveitis, or another condition requiring specific treatment.

If you experience sudden, severe visual loss in one or both eyes, call 999 or attend A&E immediately.

Report any suspected adverse reactions via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk .

Sources

• Celluvisc, Summary of Product Characteristics (EMC)
• Carmellose sodium, British National Formulary (BNF)
• Dry eye syndrome, NICE CKS
• Dry eyes, NHS
• Dry Eye, College of Optometrists Clinical Management Guidelines
• MHRA Yellow Card Scheme