What does miosis signify in an ocular examination?

Miosis refers to the constriction of the pupil, which is a significant finding during an ocular examination. This reaction can occur in response to various stimuli, such as exposure to bright light, certain medications, or as a physiological response in some cases of ocular disease. For instance, in conditions affecting the parasympathetic nervous system, such as uveitis or acute glaucoma, miosis may be observed as the body attempts to protect the eye or respond to changes in intraocular pressure.

Recognizing miosis is important because it helps veterinary ophthalmologists assess the health of the eye and related neurological functions. The ability to distinguish between miosis and other pupil responses, such as mydriasis (dilated pupil), is crucial for a comprehensive ocular examination and can aid in diagnosing underlying conditions or diseases affecting the animal's vision and overall ocular health.