Veterinary advice should be sought before applying any treatment or vaccine.


Cataracts are the clouding of the lens inside the eye which affects the horse's vision. The severity of vision loss depends on the location and extent of the opacity.

Cataracts can occur in horses of all ages and can be developmental (including congenital forms) or acquired (secondary). Cataracts are classified according to the degree of opacity (incipient, immature, mature or hypermature), location (anterior, posterior, perinuclear, nuclear or equatorial, capsular, subcapsular or cortical), age of onset (congenital, juvenile, senile) or cause (traumatic, inflammatory, toxic or metabolic). Not all cataracts will require treatment, however it is best to have regular check ups with your veterinarian to catch them if they progress.


Milky appearing pupil
Evidence of impaired vision


  • Clinical signs
  • Physical exam


Topical and systemic steroids or NSAIDs
Surgery - Phacoemulsification
Mydriatic therapy

Scientific Research References

Good Overviews

Risk Factors

  • Trauma
  • Genetics
  • Metabolic disease
  • Age