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Evaluation and Diagnosis of Pupil Disorders

Almost all true emergent conditions... can be picked up by a pupil examination. With Horner syndrome, we are particularly worried about internal carotid artery dissection due to the risk of stroke. Both a cranial nerve III palsy involving the pupil and aberrant regeneration can indicate an aneurysm. A mid-dilated pupil with high intraocular pressure indicates angle-closure glaucoma.

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 Pupil Testing: Implications for Diagnosis

Diagnosing and managing many retinal and neurological conditions begins with the pupil. These testing techniques and tips will ensure you catch commonly encountered pupil disorders right away. Careful observation of the pupils can reveal important information about the autonomic nervous system, and further evaluation with pharmacologic testing can help confirm sympathetic or parasympathetic deficits. These clinical observations and tests can ensure ODs provide patients and comanaging practitioners the information necessary for appropriate treatment, even for those who may not even know they have a neurological condition.

Articles of Interest

Conditions that Affect the Pupil

Up to 20% of healthy people have pupils that are different sizes – some are normal but others are signs of a serious health issue.

Diagnostic Approach to Pupillary Abnormalities

Assuming that motor nerves to pupil and iris muscles are intact, an asymmetry of light signaling between the two eyes will result in a difference in pupil responses between stimulation of the right versus the left eye. This is the relative afferent pupillary defect (RAPD), best seen with alternating light stimulation. An RAPD is a sensitive indicator of optic nerve dysfunction.

Disorders of the pupil

Pupil size is determined by the interaction of the parasympathetic and the sympathetic nervous system. The parasympathetic system conducts the light reaction with its major center in the dorsal midbrain. The sympathetic nervous system acts either directly on the dilator muscle (peripherally) or centrally by inhibiting the Edinger-Westphal nucleus. Psychosensory reactions are transmitted via the sympathetic system. The afferent input of the light reflex system in humans is characteristically wired, allowing a detailed analysis of a lesion of the afferent input

The Ultimate Guide to Pupil Abnormalities

In optometry school, our professors often stress how important close observation of a patient’s pupils can be in assessing his or her ocular and systemic health. However, in every day practice, this facet of the exam can be easily overlooked, particularly if technicians are checking instead of doctors. In an effort to remind us of the importance of this exam element, this guide will review how to discern between different presentations of anisocoria, as well as touch on some of the other causes of abnormal pupil findings.