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Archive Case #206: Ovine Entropion

Sheep veterinary case - Easy - September 25, 2026

Clinical Clues

  1. During the morning lambing check, one of a pair of two-day-old twins keeps its right eye tightly shut.
  2. The eye waters continuously, and the lamb rubs that side of its face against its mother.
  3. Fluorescein staining reveals a small superficial corneal ulcer. The clinician looks for what is keeping the eye irritated.
  4. No foreign body is found. Hairs from the lower eyelid are touching the irritated corneal surface.
  5. With the eyelid held in its normal position during examination, the hairs no longer touch the eye.
  6. When released, the lower eyelid margin rolls inward again, turning the haired skin towards the cornea.

Diagnosis

Ovine Entropion

The inward-turned lid brings hairs against the cornea, perpetuating irritation and damage. This is entropion. Corneal ulceration is also present, but does not describe the demonstrated lid abnormality. Pain can itself worsen lid inversion, so these findings do not prove an inherited or primary cause. Remember: Examine eyelid position as well as the corneal surface; lid malposition can keep the eye irritated.

Learning review

Review the case evidence

Use the paired clues to explain how the evidence in this sheep case supports the provided diagnosis, Ovine Entropion, then compare your reasoning with the case explanation.

Evidence checkpoints

Clues 1-2

  1. Clue 1: During the morning lambing check, one of a pair of two-day-old twins keeps its right eye tightly shut.
  2. Clue 2: The eye waters continuously, and the lamb rubs that side of its face against its mother.

Clues 3-4

  1. Clue 3: Fluorescein staining reveals a small superficial corneal ulcer. The clinician looks for what is keeping the eye irritated.
  2. Clue 4: No foreign body is found. Hairs from the lower eyelid are touching the irritated corneal surface.

Clues 5-6

  1. Clue 5: With the eyelid held in its normal position during examination, the hairs no longer touch the eye.
  2. Clue 6: When released, the lower eyelid margin rolls inward again, turning the haired skin towards the cornea.

Self-review prompts

  1. After clues 1-2, what evidence from this sheep case shaped your initial interpretation?
  2. When you compare clues 3-4 with clues 1-2, what changed in your reasoning about Ovine Entropion?
  3. How do clues 5-6 align with the case explanation for Ovine Entropion?

Educational Use

Vetdle archive cases are educational veterinary games for diagnostic reasoning practice. They do not provide veterinary advice, diagnosis, treatment, or professional medical guidance.