Keratitis

From Cat
File:Fek1.jpg
Gross appearance of feline keratitis. In this case, caused by feline herpes virus, white plaques partially cover portions of the cornea. Neovascularization also is present (image courtesy of Dr. U. Dietrich).

Keratitis is an inflammatory corneal disease characterised as either ulcerative and nonulcerative in type. Both types are relatively common in cats. In the cat, both superficial and and deep vessels may only be apparent once they are within the cornea. and careful observation is necessary to determine the level of vascularisation.

Chemosis (swelling or oedema of the eyelids) is often dramatic because of the loose nature of the feline conjunctiva. Corneal pigmentation as a response to insult is rare incats, except for changes in limbal pigment which are sometimes a feature of perinatal problems and eosinophilic keratitis due to feline herpes viral infection[1][2][3].

Proliferative (eosinophilic) keratoconjunctivits and sequestrum formation[4] are both relatively common feline problems without a canine equivalent[5]

References

  1. Morgan RV, Abrams KL, Kern TJ. (1996) Feline eosinophilic keratitis; A retrospective study of 54 cases (1989-1994). Vet Comp Ophthalmol 6:131-134]
  2. Larocca RD. Eosinophilic conjunctivitis, herpes virus and mast cell tumor of the third eyelid in a cat. Vet Ophthalmol 2000;3:221-225
  3. Keil SM, Olivero DK, McKeever PJ, Moore FM. (1997) Bilateral nodular eosinophilic granulomatous inflammation of the nictitating membrane of a cat. Vet Comp Ophthalmol 7:258-262.
  4. Morgan RV. (1994) Feline corneal sequestration: A retrospective study of 42 cases (1987-1991). J Am Anim Hosp Assoc 30:24-28.
  5. Barnett, KC & Crispin, SM (2002) Feline Ophthalmology: An atlas & text. Saunders, USA