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Health condition · Clinically reviewed

Keratoconus, topography, cross-linking - and when a corneal transplant fits.

A progressive change in the shape of the cornea - detected early on topography, stopped by cross-linking, and rehabilitated with modern contact lenses and, when needed, surgery.

Jump to treatment
A radiographer guides a patient onto the bed of an advanced 3 Tesla MRI scanner in a London imaging suite

Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a UK-registered ophthalmology clinician before publication.

  • 02

    Sourced from guidance

    Checked against RCOphth, NICE and peer-reviewed corneal literature you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK practice - corneal topography, cross-linking, intracorneal ring segments and DALK.

Key facts

Keratoconus at a glance.

The essentials, in plain English - what it is, who it affects, and how modern UK cornea services approach it.

  • What it is

    A progressive corneal ectasia - thinning of the cornea with conical protrusion and irregular astigmatism.

  • Who it affects

    Usually starts in adolescence or young adulthood, bilateral but asymmetric, and typically progresses over years.

  • Why it happens

    Multifactorial - genetic predisposition, chronic eye rubbing, atopy and some connective tissue disorders.

  • How it is diagnosed

    Corneal topography is the gold standard - detecting subclinical disease and progression long before vision is lost.

  • How progression stops

    Corneal collagen cross-linking (CXL) halts progression - the single biggest advance in modern keratoconus care.

  • When surgery is needed

    For advanced or scarred corneas, ring segments (ICRS) or a deep anterior lamellar keratoplasty (DALK) restore vision.

Why this guide matters

Detected on a scan, stopped by a light.

Keratoconus used to end in a corneal transplant for most patients. Modern imaging and cross-linking have changed that story completely.

  • Topography changed diagnosis

    Modern corneal mapping detects keratoconus long before the vision drops - so treatment can start when it still preserves sight.

  • Cross-linking changed prognosis

    A single riboflavin and UVA treatment halts progression in most eyes - a genuine disease-modifying therapy for a corneal condition.

  • Contact lenses changed comfort

    Modern scleral and RGP lenses rehabilitate vision even in advanced keratoconus - most patients never need a transplant.

How the diagnosis is made

From changing glasses to a corneal map.

The steps a UK optometrist and corneal specialist will normally follow, in order - so you know what to expect and why.

  1. 01

    Assessing

    History and risk factors

    A structured history - eye rubbing, atopy (hay fever, eczema, asthma), family history and rate of prescription change.

  2. 02

    Assessing

    Refraction

    Progressive myopia and irregular astigmatism that keeps changing - and best-corrected vision that plateaus below normal.

  3. 03

    Assessing

    Slit-lamp examination

    A specialist looks for corneal thinning, a Fleischer ring, Vogt striae and, in advanced disease, Munson sign on downgaze.

  4. 04

    Confirming

    Corneal topography

    Placido, Scheimpflug or OCT-based mapping - the gold standard for confirming the cone, staging severity and tracking progression.

  5. 05

    Confirming

    Pachymetry and aberrometry

    Thinnest-point measurement and higher-order aberration analysis - both feed into treatment decisions, especially before cross-linking.

  6. 06

    Planning

    Specialist ophthalmology review

    A corneal specialist confirms the diagnosis, stages the disease and discusses whether progression is documented and treatable.

  7. 07

    Planning

    MDT plan

    Optometry, cornea and, where relevant, dermatology and allergy input - so contact lenses, atopy control and surgery align.

Typical timeline: a first optometry concern to a corneal-clinic plan within weeks.

Symptoms

What keratoconus feels like.

The everyday clues, the specialist slit-lamp signs, and the features that mean it is time to escalate quickly.

  • Progressive short-sightedness

    A prescription that keeps changing every few months - especially in a teenager or young adult - is a classic early clue.

  • Irregular astigmatism

    Astigmatism that is asymmetric between eyes and hard to correct with a standard spectacle prescription.

  • Blurred, ghosting vision

    Vision that stays blurred or double even with new glasses - the cornea is bending light unevenly.

  • Reduced best-corrected vision

    Vision that will not sharpen fully with any spectacle prescription - a red flag that warrants topography.

  • Fleischer ring and Vogt striae

    Specialist slit-lamp findings - an iron ring around the cone base and fine vertical stress lines in the deep cornea.

  • Munson sign

    On downgaze the lower eyelid is pushed into a V shape by the cone - a sign of more advanced disease.

  • Chronic eye rubbing

    Habitual, forceful rubbing - often driven by atopy - is one of the strongest modifiable drivers of progression.

  • Red flag - acute hydrops

    Sudden painful vision loss with corneal whitening - Descemet membrane has ruptured. Urgent specialist assessment.

Treatment

How keratoconus is treated in the UK.

Glasses and lenses to see, cross-linking to stop the disease progressing, and surgery reserved for the eyes that need it.

  • Spectacles and soft lenses

    Early keratoconus is often correctable with glasses or soft contact lenses - first-line while topography is monitored.

  • Rigid gas permeable lenses

    RGP lenses vault the cone and mask irregular astigmatism - a mainstay for moderate keratoconus in specialist optometry.

  • Scleral contact lenses

    Large-diameter lenses that rest on the sclera and bridge the cornea - excellent for advanced or intolerant eyes.

  • Eye-rubbing and atopy control

    Stopping eye rubbing and treating hay fever, eczema and vernal keratoconjunctivitis is disease-modifying, not optional.

  • Corneal collagen cross-linking

    Riboflavin plus UVA (Dresden or accelerated protocols) - the definitive intervention that halts progression in most eyes.

  • Intracorneal ring segments

    Intacs, Ferrara or Kera segments reshape the cornea and reduce astigmatism - useful before considering a transplant.

  • DALK corneal transplant

    Deep anterior lamellar keratoplasty replaces the diseased stroma while preserving the patient’s own endothelium.

  • Penetrating keratoplasty

    A full-thickness graft - reserved for advanced disease, deep scarring or failed DALK, and provided by tertiary corneal units.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your optometrist or corneal ophthalmologist knows your eyes and can tell you which parts apply to you. If in doubt, get seen.

  • Royal College of Ophthalmologists (RCOphth). Keratoconus guidance and CXL commissioning standards.

  • NICE. Interventional procedures guidance - photochemical corneal collagen cross-linkage for keratoconus (IPG466).

  • NHS England. Clinical commissioning policy - corneal collagen cross-linking for progressive keratoconus.

  • Global Consensus on Keratoconus and Ectatic Diseases (Cornea, peer-reviewed).

  • Keratoconus Group UK. Patient information and support resources.

Red flags

When keratoconus needs urgent attention.

Most keratoconus is managed in a planned outpatient corneal clinic. These are the situations that need faster action.

  • Acute corneal hydrops

    Sudden painful vision loss with a white, oedematous cornea - Descemet membrane rupture. A specialist emergency needing urgent corneal review.

  • Rapid progression in a young eye

    Documented topographic progression in a teenager or young adult - cross-linking should be discussed without delay.

  • Best-corrected vision falling

    Vision that will not correct with any glasses prescription - a signal that contact lenses or surgery should be planned.

  • Persistent forceful eye rubbing

    Ongoing eye rubbing, particularly with atopy, actively drives disease. Treating the itch is part of treating the cornea.

  • Corneal scarring at the cone apex

    Central scarring that limits vision even in a well-fitted contact lens - a trigger for surgical discussion.

  • Post-LASIK ectasia

    New keratoconus-like changes after refractive surgery - needs urgent specialist review and often cross-linking.

  • Contact lens intolerance

    Repeated lens rejection or discomfort in a functioning eye - reassess with scleral fitting or plan intervention.

  • Family history in an untested sibling

    A first-degree relative with keratoconus makes baseline topography for children and young adults worthwhile.

  • Poor cornea after a transplant

    Any graft with declining vision, thinning or new astigmatism warrants urgent corneal-clinic follow-up.

Living with it

A treatable condition, with a clear ladder.

Four things that make the biggest difference day to day - stop rubbing, keep the scans, act on progression early and get properly fitted contact lenses.

A quiet reminder

Early cross-linking beats late transplantation.

A twenty-minute treatment at the right moment protects vision for decades - do not wait for a crisis to accept the referral.

  1. 01 Stop rubbing

    Do not rub your eyes

    This is the single most important thing you can do. Treat the itch - control hay fever, eczema and dry eye rather than rubbing them out.

  2. 02 Monitor

    Keep your topography appointments

    Progression is invisible to you but obvious to a scan. Consistent follow-up catches change early enough for cross-linking.

  3. 03 Escalate

    Ask about cross-linking early

    If your scans show change, do not wait. CXL is far more effective when the cornea is still relatively healthy.

  4. 04 Fit

    Invest in the right contact lens

    A specialist RGP or scleral fitting is the difference between struggling with vision and getting on with life.

Frequently asked

Everything we get asked about keratoconus.

Quick answers on causes, topography, cross-linking, contact lenses and corneal transplants.

  • What is keratoconus?

    Keratoconus is a progressive corneal ectasia - the cornea gradually thins and bulges into an irregular cone shape. This distorts light entering the eye and causes progressive short-sightedness and irregular astigmatism, usually starting in adolescence or young adulthood and affecting both eyes asymmetrically.

  • What causes keratoconus?

    The cause is multifactorial. A genetic predisposition combined with chronic eye rubbing and atopic conditions - hay fever, eczema and asthma - is the classic driver. It is also more common in some connective tissue disorders including Ehlers-Danlos syndrome, Down syndrome and Marfan syndrome, and can follow refractive surgery in susceptible eyes.

  • How is keratoconus diagnosed?

    Corneal topography is the gold standard. Placido-disc, Scheimpflug and OCT-based mapping produce detailed elevation and thickness maps of the cornea that can detect keratoconus long before it is visible on a slit lamp, and can track progression over time.

  • Can keratoconus be stopped from getting worse?

    Yes - in most cases. Corneal collagen cross-linking (CXL) uses riboflavin and ultraviolet-A light to stiffen the corneal collagen and halt progression. It is NHS-commissioned for progressive disease and is the single biggest advance in modern keratoconus care.

  • Do I need a corneal transplant?

    Most people with keratoconus never need a transplant. When surgery is needed, deep anterior lamellar keratoplasty (DALK) is usually preferred - it replaces the diseased stroma while preserving your own endothelium, giving a longer-lasting graft. Full-thickness (penetrating) keratoplasty is reserved for the most advanced or scarred eyes.

  • Why does everyone tell me to stop rubbing my eyes?

    Because forceful, repetitive rubbing genuinely drives the disease. Every hard rub microscopically weakens the cornea. Controlling the underlying itch - treating hay fever, eczema or vernal keratoconjunctivitis - is part of treatment, not a lifestyle add-on.

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