Canis ISSN: 2398-2942

Pigmentary keratitis

Contributor(s): David L Williams

Introduction

  • Cause: chronic keratitis → melanin deposition in cornea.
  • Signs: superficial corneal vascularization and pigmentation.
  • Common in brachycephalic breeds.
  • Diagnosis: history, clinical signs, breed, ophthalmic examination.
  • Treatment: remove cause, corneal lubricants, keratectomy if severe.
  • Prognosis: guarded - may only be able to control signs.
  • See also keratitis Keratitis.

Pathogenesis

Etiology

  • Appear to be a combination of factors:
    • Prominent globes → lagophthalmos (inadequate spreading of precorneal tear film over central cornea) → corneal dry spots formation.
    • Corneal contact with nasal skin folds or excessive amounts of hair located at the medial canthus → corneal friction.

Predisposing factors

General
  • Brachycephalic conformation: prominent globes → tear film abnormalities → corneal dry spots.
  • Nasal skin folds + length of facial hair: direct corneal contact at the nasal canthus. Trichiasis Trichiasis.

Diagnosis

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Treatment

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Outcomes

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Further Reading

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