Cloudy Eyes: Scarring, Corneal Edema, and Cataracts in Horses
  by Robert N. Oglesby DVM

You can divide horses with cloudy eyes into two groups: those with recent onset cloudiness who are squinting from pain and those with slow onset or long-standing cloudiness without signs of irritation. Within both groups there are several different possible explanations. Cloudiness can result from changes in several different structures in the eye. The outer most layer is the cornea and is tough. Next layer in would be the anterior chamber which is filled with a clear fluid and behind the anterior chamber is the lens. Cloudiness can be due to changes in any one of these layers and the layer effected determines the likely diseases to be present. This article deals with determing the layer and the list of possible diseases effecting the horse. Links are provided to specific articles on the diseases.

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