Equine Recurrent Uveitis (Moon Blindness): Clinical Signs and Pathogenesis

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1. Moon Blindness (ERU)

Equine Recurrent Uveitis (ERU), popularly referred to as Moon Blindness, is the most common cause of blindness in horses. The condition entails recurrent episodes of intraocular inflammation within the uveal tract consisting of the iris, ciliary body, and choroid. As opposed to superficial conjunctivitis, Moon Blindness is a deep-seated immune-mediated condition that causes permanent damage.
Anatomy of Equine Uveitis: A comparative diagram illustrating the clinical manifestations of Moon Blindness. The right panel demonstrates corneal edema and a constricted pupil (miosis), highlighting the inflammation and pain associated with the disease. | VetInsight PK


2. Cause/Trigger of Moon Blindness

The specific cause is often difficult to identify, but the following may precipitate the first episode:

Infectious Agents:

 Most commonly caused by Leptospirosis (Leptospira interrogans).

Immune-mediated response: 

Involves the development of an autoimmune reaction against ocular tissues.

Genetic susceptibility: 

Certain breeds such as Appaloosas are predisposed to ERU.

Environmental: 

Past trauma or injury to the eye that causes inflammation.

3. Sign & Symptoms during "Flare-Up"

The following symptoms characterize ERU during an acute phase:
Blepharospasm and photophobia: Squinting and intolerance to bright lights.

Epiphora: 

Excessively watery eyes.

Corneal edema: 

A cloudy or bluish-colored surface of the eye.
Miosis: Pupils are small (pinpoint) and do not dilate readily.

Hypopyon: 

White pus cells in the anterior chamber of the eye

4. Chronic Ocular Consequences

The repeated inflammatory episodes ultimately result in permanent damage:

- Cataracts: 

Lens opacities.

- Secondary Glaucoma:

 Intraocular pressure elevation.

- Lens Dislocation: 

Detachment of the lens owing to structural weakness.

- Phthisis Bulbi: 

Shrinking and non-functional eManageme5. Treatment Approach and Management
A multi-pronged approach including topical and systemic treatment modalities is necessary for effective ERU management.


Treatment Category Clinical Objective & Medication
Anti-Inflammatories Topical corticosteroids such as Dexamethasone or Prednisolone to suppress the local immune response.
Mydriatic Agents Atropine Sulfate (1%) to dilate the pupil, relieve painful ciliary spasms, and prevent synechia.
Systemic NSAIDs Oral administration of Flunixin Meglumine (Banamine) for generalized pain relief and inflammation control.
Surgical Implants Sustained-release Cyclosporine devices surgically placed in the eye to provide long-term immunosuppression.

Conclusion 

Conclusion Thus, Equine Recurrent Uveitis (ERU) can be termed a highly complicated and debilitating disease of the eyes. Due to its recurrence, early clinical management is vital if any vision impairment is to be avoided. Although various treatment methods and implants have been developed to control inflammation, no permanent solution for ERU has been discovered yet. Regular eye monitoring, reduction of exposure to triggers, and cooperation with an equine ophthalmologist are key measures for ensuring the well-being of ERU-susceptible horses.

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