A survey of ocular pathology in Warmblood horses in South Africa.
Authors: Allen Ramona, Goodhead Antony D
Journal: Equine veterinary journal
Summary
# Ocular Pathology in Warmblood Horses: A South African Survey Despite the widespread use of Warmbloods across international equestrian sport, no previous research has characterised ocular disease prevalence in this breed, prompting a descriptive observational study of 104 South African Warmbloods (208 eyes, mean age 11 years) using comprehensive ophthalmic techniques including slit-lamp biomicroscopy, tonometry and indirect ophthalmoscopy. The findings were striking: ocular pathology was identified in 76% of horses and 60% of individual eyes, with chorioretinal lesions predominating at 48.1% of eyes examined, followed by cataracts (9.1%) and iris lesions (9.1%). Particularly significant was the age-dependent progression of disease, with both focal and total chorioretinal lesions showing statistically significant increases across age categories (p=0.002–0.008), as did cataract prevalence (p=0.02–0.03). For equine practitioners, these findings underscore the importance of formal ophthalmic examination as standard practice during routine health assessments and prepurchase evaluations, especially given that the high prevalence observed likely reflects the age-related degenerative nature of chorioretinal pathology in this population. Whilst the study's geographic limitation and convenience sampling restrict generalisation beyond South African Warmbloods, the data provide valuable baseline reference values for this breed and highlight potential need for breed-specific eye screening protocols.
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Practical Takeaways
- •Include comprehensive ophthalmic examination in routine health checks and prepurchase evaluations for Warmblood horses, as three-quarters of this population showed ocular pathology
- •Be particularly vigilant for age-related ocular changes in older Warmbloods; chorioretinal lesions and cataracts increase significantly with advancing age
- •Recognize that chorioretinal lesions are the dominant ocular finding in this breed, affecting nearly half of all examined eyes and two-thirds of horses
Key Findings
- •Ocular pathology was present in 76% of Warmblood horses examined (79/104 horses), with 60.1% of eyes affected (125/208 eyes)
- •Chorioretinal lesions were the most common finding, present in 62.5% of horses (65/104) and 48.1% of eyes (100/208)
- •Cataracts and chorioretinal lesions both statistically increased with age across all age categories (p=0.002-0.03)
- •Iridial lesions were present in 11.5% of horses and 9.1% of eyes, while cataracts affected 12.5% of horses and 9.1% of eyes