Corneal disease of horses (Proceedings)


Corneal disease of horses (Proceedings)

Apr 01, 2010

     • Scraping for Cytology and Cultures
          o The cultures should be done before any drops, (drugs contain bacteriostatic agents)
          o Topical anesthetics and the handle end of a scalpel blade to scrape.
          o Sterile dacron swabs for culture.
     • Culture cornea BEFORE applying anything to the eye if overt infection is suspected
          o Aerobic
          o Fungal
     • Fluorescein stain every eye that is PAINFUL!
          o Blepharospasm
          o Epiphora
          o Redness
          o Corneal opacities
     • Rose Bengal Stain
          o Viral Keratitis
          o Early Fungal Keratitis
          o Assess tear film
     • Deep corneal scrapings, at the edge and base of the ulcer to detect bacteria and fungal hyphae
     • Obtained with topical anesthesia and the blunt, handle end of a sterile scalpel blade.
     • Superficial swabbing cannot be expected to yield fungi in a high percentage of cases.

Corneal ulceration
     • Characterize
          o Depth
               • Superficial
               • Deep (Stromal)
               • Descemetocele
               • Perforating
          o Cause
               • Infectious (fungal, bacterial, viral)
               • Traumatic
               • Immune-mediated
          o Duration
               • Response to previous treatments

Superficial ulceration
     • Epithelium only
     • Foals (Increased incidence compared to adults)
          o Corneal sensitivity in foals is very poor.
          o Lower tear production in foals compared to adult's

     • Painful

Stromal ulceration
     • Epithelium and collagen is lost
     • Variation of the clinical picture
     • Descemetoceles
          o Epithelium and stroma are not present
          o Buldge of DM into the defect
          o EMERGENCY!