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[Two rare lens abnormalities in horses].

H Gerhards1, H Werry, E Deegen

  • 1Klinik für Pferde der Tierärztlichen Hochschule Hannover.

Tierarztliche Praxis
|June 1, 1992
PubMed
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Congenital equine lens defects, including coloboma and ectopia, are rare. This study details two cases in young horses, highlighting clinical features and associated ocular anomalies.

Area of Science:

  • Ophthalmology
  • Veterinary Medicine
  • Equine Genetics

Background:

  • Congenital defects of the crystalline lens, such as coloboma and ectopia, are infrequently diagnosed in horses.
  • Understanding these rare conditions is crucial for equine ophthalmology and veterinary diagnostics.

Observation:

  • Detailed clinical and ophthalmoscopic examinations were performed on a 3-year-old Hanoverian stallion with lens coloboma and a 6-month-old Hanoverian filly with an ectopic lens.
  • The stallion exhibited lens coloboma alongside partial zonular coloboma.
  • The filly presented with a small, spherical ectopic lens (microphakia/spherophakia) and vitreous abnormalities (syneresis and floaters).

Findings:

  • The study describes the specific clinical manifestations of congenital lens coloboma and ectopia in two distinct equine cases.

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  • Associated anomalies included partial zonular coloboma in one case and microphakia/spherophakia with vitreous changes in the other.
  • Despite potential prenatal influences, the ectopic lens position was classified as congenital.

    • Implications:

    • These findings contribute to the limited literature on congenital equine lens defects, aiding in their diagnosis and management.
    • The cases underscore the importance of thorough ophthalmic examination to identify associated ocular abnormalities.
    • Further research into the genetic and developmental factors underlying these rare equine conditions is warranted.