ISSN 2398-2985      

Trichiasis

6guinea pig

Synonym(s): Texel neonatal lid conformation, Rex neonatal lid conformation


Introduction

  • Cause: because of the bristly, fuzzy hair coats of the Texel and Rex breeds, many neonates have trichiasis due to the hair on the lids projecting inward to the corneal surface. In other breeds trichiasis is associated with entropion.
  • Signs: blepharospasm, lids are closed, appear inflamed, may have epiphora and corneal edema. Discomfort and pain, particularly if bilateral, may interrupt normal activities including nursing.
  • Diagnosis: physical examination of the eyelids, corneal integrity examination including fluorescein dye.
  • Treatment: at birth, petrolatum jelly or ophthalmic lubricant ointment can be applied to hair around eyes, lids and particularly at the canthi to direct the hairs away from the eye and prevent it from abrading the corneal surface. Cornea damaged: lubricate hair on lids away from cornea, NSAID topical drops, antibiotic ointment or drops.
  • Prognosis: good if done at birth before any eye damage. If cornea is involved, prognosis is still usually good for healing if medicated.
Print off the Owner factsheets on Eye problems and Giving your guinea pig a health check to give to your clients.

Pathogenesis

Etiology

  • Texel and Rex breeds have bristly, fuzzy, thick coats and hair on the eyelids.
  • Neonates (Texel, Rex) may have the eyelids with hair turned into the cornea, initially causing abrasion .
  • Trichiasis usually with entropion Entropion has been found in smooth-haired guinea pigs.

Predisposing factors

General

  • Neonatal guinea pig.

Specific

  • Texel breed.
  • Rex breed.
  • Smooth coated breeds may have a lid conformation problem where the lids turn-in, as with entropion Entropion, however hair must touch the cornea to cause abrasion.

Pathophysiology

  • Trichiasis due to the breed hair and conformation abrades the corneal surface.
  • This causes pain, watering, blepharospasm, then inflammation of the lids.
  • Continued abrasion may lead to corneal ulceration.

Timecourse

  • Neonates: problem develops in the first few hours post-parturition.
  • Entropion Entropion with trichiasis in smooth haired guinea pigs may have a slow onset although it usually shows up in the first few weeks of life.

Epidemiology

  • Breeders with affected animals may be contributing to the perpetuation of this problem by breeding from affected animals, or continuing to breed from adults that continually have litters with high incidence of this problem.

Diagnosis

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Treatment

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Prevention

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Outcomes

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Further Reading

Publications

Refereed papers

Other sources of information

  • Williams D L (2013) Laboratory animal ophthalmology. In: Veterinary Ophthalmology 5th edn. Eds: Gellatt K N, Gilger B C & Kern T J. Willey-Blackwell. pp 1692-1725.
  • Williams D L (2012) The Guinea Pig Eye. In: Ophthalmology of Exotic Pets. Wiley-Blackwell. pp 56-72.

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