Clinical Evaluation of Ocular Discharge in Small Animals
Ocular discharge is a non-specific clinical sign that requires systematic evaluation to differentiate between benign physiological conditions and sight-threatening ocular or systemic diseases. This article outlines the diagnostic approach to characterizing discharge and interpreting its significance across species.
Clinical summary
- Clinical signs
- Variations range from serous (watery), mucoid (thick/sticky), to purulent (yellow/green). Additional signs include blepharospasm, epiphora, conjunctival hyperemia, and ocular pruritus.
- Possible causes
- Etiologies include conjunctivitis, corneal ulcers, keratoconjunctivitis sicca (KCS), uveitis, glaucoma, nasolacrimal duct obstruction, and systemic infectious diseases such as feline herpesvirus.
- Diagnostic approach
- Comprehensive ophthalmic examination including Schirmer Tear Test (STT), fluorescein staining, intraocular pressure measurement (tonometry), and slit-lamp biomicroscopy. Culture and sensitivity testing may be indicated for chronic purulent discharge.
- Management
- Treatment is etiology-specific. Requires managing the underlying cause, which may include topical antibiotics, anti-inflammatories, tear stimulants (e.g., cyclosporine), or surgical correction of adnexal abnormalities.
References
- [1]Kirk N. Gelatt. Veterinary Ophthalmology (2021)
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