Recurrent Corneal Erosion – When the Pain Returns Every Morning

Some patients know this pattern all too well: an ordinary night, and then in the morning – the instant the eyes open – sharp pain, tearing and light sensitivity that fade after a few hours or days and come back again weeks later. This is recurrent corneal erosion – a common, frustrating and very treatable condition. This page explains why it happens, how it is diagnosed, and what the treatment ladder looks like – from a simple bedtime ointment to laser treatment.

What recurrent corneal erosion is

The epithelium is the thin outer layer of the cornea. Normally it is firmly anchored to the layer beneath it by microscopic “anchors”. In recurrent corneal erosion this anchoring is weak in one area, so an everyday action – above all opening the eyes in the morning, when the eyelid has “stuck” to the dry cornea overnight – is enough to tear a patch of epithelium away. The result is sudden sharp pain, tearing, light sensitivity and a foreign-body sensation, returning again and again over months or years.

Why it happens

Two causes account for most cases:

An earlier corneal scratch. The typical history is a superficial injury – a baby’s fingernail, a branch, a sheet of paper, the corner of a towel – that seemed to heal within a day or two, but the new epithelium that formed over it never bonded properly to the tissue underneath. The first episode usually appears weeks to months after the injury, and sometimes the patient no longer remembers it.

Epithelial basement membrane dystrophy (EBMD). This is a common, inborn condition unrelated to injury, in which the basement membrane itself is irregularly built. At the slit lamp it shows fine lines, dots or a fingerprint-like pattern – hence the older name “map-dot-fingerprint dystrophy”. Both eyes may be involved, even if only one hurts.

Conditions that make the picture worse: dry eye, blepharitis and meibomian gland dysfunction, diabetes, and ocular rosacea. Treating them is an integral part of treating the erosion.

What it feels like

The symptoms are highly characteristic, and the story alone usually raises the suspicion:

• Sharp pain that begins on opening the eyes in the morning or during the night, not during the day.
• Tearing, redness and strong light sensitivity.
• A feeling of “something in the eye” and temporary blurred vision.
• An episode lasts from minutes to days, then settles – until the next one.

Between episodes the eye looks quiet, so a doctor who sees the patient only on good days may miss the diagnosis. It is important to describe the recurring pattern precisely.

How it is diagnosed

The diagnosis is clinical. An ophthalmologist examines the cornea at the slit lamp with fluorescein dye, which highlights the area where the epithelium is torn or loose. Even when the eye is calm, subtle signs of unstable epithelium or of EBMD can sometimes be seen, and the other eye is always examined too. In unclear cases, anterior-segment OCT demonstrates the changes in the front layers of the cornea and helps plan treatment.

Treatment: step by step

The principle is to let the epithelium regenerate and re-anchor to the tissue beneath it – a process that takes months – and to protect it until then. Treatment is stepwise, and most patients stop at an early step.

The acute episode

During an episode the tear is treated like a scratch: an antibiotic ointment for protection, sometimes dilating drops to ease the pain, and for a large defect a bandage contact lens that covers the cornea and allows pain-free blinking until it heals.

Preventing the next episode – the foundation for everything else

• Consistent, long-term lubrication. Preservative-free drops during the day and an eye ointment at bedtime, every night, for months – not just until the pain passes. The night ointment stops the lid from sticking to the cornea, and it is the one treatment almost every patient needs.
• Hypertonic saline ointment. An ointment with a high salt concentration at bedtime draws fluid out of the epithelium, strengthens its adhesion and reduces episodes. Mild stinging at the start is expected.
• Doxycycline and a mild steroid. A low-dose doxycycline tablet, combined with a mild steroid drop for a few weeks, inhibits the enzymes that break down the epithelium’s “anchors”. This combination is particularly effective in cases that recur despite lubrication.
• Treating associated conditions. Blepharitis and dry eye are treated in parallel; punctal plugs are sometimes recommended.

A bandage contact lens for an extended period

When episodes continue despite medical treatment, a soft contact lens can be left on the eye continuously for weeks, under supervision, to give the epithelium an uninterrupted quiet period to regenerate and anchor. In suitable cases autologous serum drops are also used.

Procedures

A minority of patients continue to have episodes after all of this. For them there are short procedures, all performed under drop anaesthesia:

• Epithelial debridement and polishing. The loose epithelium is removed and the basement layer is gently smoothed, usually with a tiny diamond burr, so that the new epithelium bonds to healthy tissue. Particularly suitable when the cause is EBMD.
• Anterior stromal puncture. A series of microscopic punctures creates tiny scar “rivets” that anchor the epithelium. Suitable only for areas outside the visual axis, because the scars can interfere with vision if they are central.
• PTK – phototherapeutic keratectomy with the excimer laser. The same laser used for PRK removes a very thin, very uniform layer from the corneal surface, and the epithelium that regrows bonds to it well. It is the preferred treatment for central or extensive cases and for EBMD, and it brings a large majority of patients a lasting end to their episodes. When there is also a small refractive error, PTK can sometimes be combined with laser correction of the prescription in the same treatment.

Even after a procedure, lubrication and the night ointment continue for months – this is the part that determines long-term success.

What is important to know

• Recurrent erosion does not harm vision in the long term when treated properly; the problem is the recurring suffering, and that can be solved.
• The most common mistake is stopping the night ointment the moment the pain goes. The epithelium needs months to re-anchor.
• Anyone who has had a corneal scratch and starts to feel morning pain weeks later should tell their eye doctor. The link between the two is not always obvious to the patient.
• Severe pain that does not settle within a day or two, discharge, or a persistent drop in vision require urgent examination, because an epithelial defect is a gateway for infection.

Who treats it in Israel

A first episode is treated by a community ophthalmologist or in an eye emergency room. When episodes recur, it is right to see a cornea specialist: the slit-lamp examination and OCT make it possible to identify EBMD and choose the right step on the treatment ladder, and procedures such as PTK are performed in cornea units and laser centres. Within the health fund this requires a referral from the treating ophthalmologist.

When to get examined

Sharp eye pain that recurs on opening the eyes in the morning, especially after an earlier corneal scratch, is a good reason to be examined by a cornea specialist – even if the eye looks calm between episodes. Prof. Michael Mimouni is a cornea specialist, and the examination establishes whether this is recurrent erosion, what is causing it, and which step of the treatment ladder suits your eye. Get in touch to arrange an examination. On other eye diseases, see eye diseases.

The information on this page is general and not a substitute for a personal examination and medical advice. Diagnosis and treatment are determined only after a full eye examination.