How long does a corneal scratch take to heal?

Twenty-four to seventy-two hours for a superficial abrasion. Beyond forty-eight hours of pain, seek care.

Should the eye be patched?

Patching does not speed healing and is no longer recommended first line for a simple abrasion.

Can an anaesthetic drop be used if someone lends one?

No, never. Repeated use blocks healing and can turn a benign scratch into a severe ulcer.

Corneal scratch: the right moves, and the ones to avoid

A superficial corneal scratch is extremely painful and almost always benign. The two statements go together: the intensity of the pain says nothing about severity, because the cornea is the most densely innervated tissue in the body.

Why it hurts so much

The cornea contains roughly three hundred to six hundred times more sensory nerve endings than skin. An abrasion a few millimetres across exposes thousands of fibres. Every blink sweeps across them — hence pain that worsens on opening the eyes and eases at rest, with watering and marked light sensitivity.

That same nerve density explains how fast repair is: the epithelium migrates to cover the bare area within twenty-four to seventy-two hours in most cases.

The first few hours

Remove contact lenses if you wear them, and do not put them back until the eye has healed.
Do not rub the eye: rubbing extends the detached area.
Rinse with saline if a foreign body is possible.
An oral analgesic — paracetamol, ibuprofen — relieves without hindering healing.
Sunglasses make the next few hours bearable.

Anaesthetic drops: the one real trap

This is the most important point on this page. An anaesthetic drop abolishes pain within seconds. It is used in the consulting room to examine the eye, and that is its only legitimate use.

Used repeatedly, it becomes toxic to the epithelium: it blocks cell migration, adhesion and division, and removes the sensitivity that protects the eye. The patient feels nothing, keeps using the product, and a simple scratch becomes an ulcer that no longer heals — sometimes with permanent visual loss. These situations exist, they are documented, and they always begin the same way: a bottle given by a relative or kept from an earlier consultation.

What should prompt a consultation

Pain that persists beyond forty-eight hours or worsens.
Reduced vision, even slight.
A white spot visible on the cornea.
Discharge, increasing redness, a swollen lid.
A scratch occurring in a contact lens wearer, a person with diabetes or an immunocompromised patient: infectious risk is higher.
An injury from plant material — branch, leaf, thorn — which exposes to particular fungal infections.

And afterwards?

A scratch that has healed well leaves no trace. But in some patients it opens a sequence of recurrent erosions: painful awakenings recurring months later, because the deep attachments of the epithelium have not re-formed. Ointment applied at bedtime for a few weeks after the initial episode reduces that risk.

When to seek care without delay. Seek care the same day in case of chemical splash, injury by a high-velocity object (grinding, hammering), deep wound or reduced vision: these are not simple abrasions.

Frequently asked questions

How long does a corneal scratch take to heal?: Twenty-four to seventy-two hours for a superficial abrasion. Beyond forty-eight hours of pain, seek care.
Should the eye be patched?: Patching does not speed healing and is no longer recommended first line for a simple abrasion.
Can an anaesthetic drop be used if someone lends one?: No, never. Repeated use blocks healing and can turn a benign scratch into a severe ulcer.