Corneal surface · Indication

Recurrent corneal
erosion

When the same pain returns, morning after morning.

Recurrent corneal erosion refers to the epithelium — the cornea’s surface covering — breaking down repeatedly, because it fails to adhere firmly to its underlying layer. It is a syndrome, that is, a set of symptoms that can have several causes: most often a past superficial injury (a fingernail, the edge of a sheet of paper, a branch), or an underlying basement membrane dystrophy.

What you may feel

The picture is very characteristic. A sudden pain on waking, at the very moment you open your eyes: the eyelid, as it lifts, peels away the fragile epithelium. The pain comes with watering, marked light sensitivity, a foreign-body sensation and sometimes blurred vision for the duration of the episode.

Between attacks, the eye is often normal. It is the repeated and unpredictable nature of these episodes — and sometimes the apprehension about waking that they eventually create — that weighs most in everyday life.

Why it happens

After a healed erosion, or on a fragile basement membrane, the epithelium does not re-anchor firmly. Overnight, the eye dries out and the superficial layer sticks to the eyelid; on waking, the movement of the eyelids is enough to tear it away again.

What is tried first

Management is step-by-step, and always begins with the least invasive measures:

  • intensive lubrication during the day, a thick ointment at bedtime;
  • hypertonic (high-salt) drops or ointment, to reduce swelling of the epithelium and encourage it to adhere;
  • a protective contact lens worn for a set period, while firm adhesion rebuilds;
  • for a limited area, away from the visual axis, superficial micro-punctures (anterior stromal puncture) can create anchoring points.

Many patients gain lasting relief at this stage, without ever needing the laser.

Why the pain occurs on waking. Overnight, the epithelium adheres poorly to its underlying layer. On waking, the opening of the eyelid lifts this superficial layer and exposes the cornea, which causes the pain.
From night to waking: a poorly anchored epithelium lifts as the eyes open.
Where PTK comes in, and what it can offer

PTK is offered when erosions remain frequent despite these measures, or when they are diffuse and linked to a dystrophy. The laser removes the unstable epithelium and the abnormal underlying layer; the regularised surface allows a new epithelium to attach more firmly.

The aim is to stop, or clearly space out, the painful episodes and to give you back stable mornings and stable vision. This is one of the indications for PTK with the most favourable results — a lasting improvement being achieved in the majority of cases, without absolute guarantee, and with the option of repeating the procedure if needed.

Stated plainly

What you should know about its limits

A recurrence remains possible, as the underlying fragility can persist. Like any PTK, a slight shift towards hyperopia is possible and can be anticipated. Recovery is that of a transPRK: a few days of discomfort while healing takes place.

How I proceed

I first look for the cause — an old scar, a dystrophy — because it guides the treatment. Mapping the cornea defines the extent of the fragile area. The choice between conservative measures, a localised procedure and PTK is made with you, according to the frequency of the attacks and their impact.

Pain that returns on waking?

Get in touch

A common cause of these erosions

Cogan’s dystrophy →

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PTK — corneal surface →