- 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 .
- Unilateral or bilateral.
- Brown pigmentation of cornea.
- Visual impairment (depends on extent of pigmentation).
- Identification of potential underlying causes of trauma.
- Other causes of corneal opacity :
- Corneal scar.
- Corneal edema.
- Corneal lipid.
- Corneal melanoma.
- Non-corneal opacity:
- Mass in anterior chamber.
- Iris melanoma.
- Guarded - most lesions are controllable not curable.
Expected response to treatment
- Pigmentation may not regress - response to therapy based on lack of further pigment deposition.
Reasons for treatment failure
- Side effects developing as a result of chronic steroid therapy.
- Incorrect diagnosis.
- Inadequate owner compliance with long-term therapy.