Exposure Keratopathy (Corneal Ulcers)
Learn what the condition is, how it may be detected early, how it is treated or managed, and which breeds or species are linked to it.
Condition snapshot
A concise guide to the condition’s pattern, detection, management and urgency.
This snapshot is a general guide, not a diagnosis or treatment plan. New, severe or worsening signs require veterinary assessment.
About the condition
Exposure keratopathy occurs when the cornea is not adequately protected by the eyelids and tear film, allowing the surface to dry and become damaged. It is particularly common in dogs with prominent eyes, shallow eye sockets or very large eyelid openings, including many brachycephalic and toy breeds. Some affected dogs cannot completely close their eyelids during sleep, so part of the cornea remains exposed for prolonged periods.
A healthy cornea is transparent and densely supplied with nerves. Drying or mechanical trauma causes significant pain. Dogs may blink excessively, squint, rub at the face or produce a watery discharge. The exposed area can become dull or hazy, and superficial damage may progress to a corneal ulcer. Prominent eyes are also physically more vulnerable to grass seeds, branches, claws and other trauma during normal activity.
Corneal ulceration is more than a surface scratch. Once the protective epithelium is lost, bacteria and inflammatory enzymes can damage deeper corneal tissue. Some ulcers deepen rapidly and can perforate the eye if treatment is delayed. Secondary inflammation inside the eye may also develop, and severe complications can lead to glaucoma or permanent vision loss.
The veterinarian also assesses eyelid closure, tear production, facial hair and eyelid abnormalities such as entropion that may be contributing.
Exposure keratopathy is often driven by conformation, so repeated ulcers should prompt consideration of the underlying anatomy rather than treating each episode in isolation. Correcting the reason the cornea remains exposed can be more effective than repeated medication after damage has already occurred.
Dogs that cannot fully close their eyelids are especially vulnerable during sleep, when the exposed central cornea can dry repeatedly and develop chronic irritation, pigmentation or ulceration.
Fluorescein staining is indicated whenever the dog squints, rubs an eye, develops increased tearing or shows new corneal haze.
Screening & Early Detection
Exposure keratopathy is screened through eye and eyelid assessment rather than a blood or genetic test. Early detection relies on examining eye conformation and recognising inadequate protection of the cornea. In dogs with prominent eyes, a veterinarian can assess whether the eyelids fully cover the cornea during blinking and whether the dog can close the eyes completely while resting or sleeping.
Routine examinations should also include tear production when dry-eye disease is suspected and careful inspection for facial hairs or inward-rolling eyelids that contact the cornea. A small ulcer may be difficult to see without stain.
Owners of high-risk dogs should check the eyes daily for asymmetry, redness, discharge or a change in surface clarity. Sudden squinting should be treated as pain, not watched for several days to see whether it resolves. Deep ulcers can worsen quickly, particularly in brachycephalic dogs.
Dogs that repeatedly develop ulcers need assessment of the eyelid opening and tear film rather than simply receiving another course of drops. Early identification of poor eyelid closure allows preventive surgery or other protective measures to be considered before permanent scarring or severe infection develops.
Diagnosis uses a complete eye examination and fluorescein staining, which highlights areas where the corneal surface has been lost.
Treatment & Management
Treatment of a corneal ulcer begins with protecting the eye from infection and further trauma while the surface heals. Topical antibiotic medication is commonly prescribed, together with pain relief and an Elizabethan collar to stop rubbing. Atropine may be used in selected cases to reduce painful internal eye spasm. Steroid eye drops are contraindicated in an active corneal ulcer because they delay healing and can worsen infection.
The depth of the ulcer determines urgency. Superficial ulcers may heal within days, but deep or rapidly melting ulcers need intensive treatment and sometimes surgery to preserve the eye. Follow-up fluorescein staining confirms healing rather than relying on the dog simply appearing more comfortable.
When exposure is the underlying cause, long-term correction is important. Surgical reduction of an excessively large eyelid opening, such as a medial canthoplasty, can improve eyelid coverage and reduce recurrence. Entropion, irritating facial folds or abnormal hairs should be corrected when present. Lubricating ointment may help dogs with mild incomplete eyelid closure, especially overnight.
Avoid home remedies and leftover eye medication because the wrong product can cause serious harm. A dog that develops increasing pain, blue-white corneal change, discharge or a visible indentation in the cornea needs urgent ophthalmic care. Treating both the ulcer and the anatomical reason for exposure gives the best chance of maintaining long-term comfort and vision.
Breeds or species affected
American Cocker Spaniel
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Basset hound
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Bloodhound
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Cavalier king charles spaniel
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Chihuahua
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Pug
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Clumber spaniel
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Lhasa apso
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Mastiff
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Newfoundland
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Pekingese
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St Bernard
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Shih tzu
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