Refinement and revalidation of the Equine Ophthalmic Pain Scale: R-EOPS a new scale for ocular pain assessment in horses.
Authors: Nannarone S, Ortolani F, Scilimati N, Gialletti R, Menchetti L
Journal: Veterinary journal (London, England : 1997)
Summary
# Editorial Summary: R-EOPS — A Refined Tool for Equine Ocular Pain Assessment Accurate pain recognition in horses with ophthalmic disease remains clinically challenging, prompting Nannarone and colleagues to refine and revalidate a composite pain scale based on facial expressions and behavioural indicators specific to ocular discomfort. The researchers assessed 13 horses with ocular pathology before and one week after treatment, alongside 16 healthy controls, recording standardised 30-second videos evaluated by eight independent observers on two occasions. The refined Equine Ophthalmic Pain Scale (R-EOPS) demonstrated excellent reliability for total score assessment (ICC>0.75), good reproducibility, and strong internal consistency (Cronbach's α=0.847), with each additional point on the scale associated with a greater than twofold increase in odds of ocular pain (OR=2.079). A threshold score of 6 achieved 83% sensitivity and 100% specificity for distinguishing horses with ocular disease, offering practitioners a validated, objective benchmark for pain quantification in clinical and research contexts. Whilst promising, the authors appropriately note that widespread clinical application and external validation across diverse equine populations remain necessary before firm recommendations can guide pain management protocols in equine ophthalmology.
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Practical Takeaways
- •R-EOPS is a reliable, validated tool for assessing ocular pain in horses using facial expressions and behavioural indicators that clinicians can apply during routine ophthalmic examinations
- •A threshold score of 6 or higher on R-EOPS reliably indicates ocular pathology, providing objective guidance for pain management decisions and treatment escalation
- •The scale demonstrates excellent reproducibility across observers, making it suitable for consistent pain monitoring throughout treatment courses in clinical practice
Key Findings
- •R-EOPS total score showed excellent inter- and intra-observer reliability (ICC>0.75) with good reproducibility (Kendall coefficient=0.786)
- •For each additional point on the R-EOPS total score, the risk of ocular pathology increased 2.08-fold (95%CI=1.542-2.804, P<0.001)
- •R-EOPS threshold score of 6 discriminated horses with ocular disease with 83% sensitivity and 100% specificity
- •High internal consistency of scale items (Cronbach's α=0.847) supports validity of the refined pain assessment tool