Other Pupillary Disorders

Failure of accommodation and convergence

Impaired accommodation and convergence are of limited diagnostic value since other clinical features are usually more prominent.

Causes - extrapyramidal disease, e.g. Parkinson's - tumours of the pineal region.

The Marcus Gunn pupil (pupillary escape)

Illumination of one eye normally produces pupillary constriction with a degree of waxing and waning (hippus).

When afferent transmission in the optic nerve is impaired, this 'escape' becomes more evident.

If the light source is 'swung' from eye to eye, dwelling 2-3 seconds on each, the affected pupil may eventually, paradoxically, dilate - a 'Marcus Gunn' pupil.

The swinging light test is a sensitive test of optic nerve retinal or macular disease.

damage but is also abnormal in

Was this article helpful?

0 0
Peripheral Neuropathy Natural Treatment Options

Peripheral Neuropathy Natural Treatment Options

This guide will help millions of people understand this condition so that they can take control of their lives and make informed decisions. The ebook covers information on a vast number of different types of neuropathy. In addition, it will be a useful resource for their families, caregivers, and health care providers.

Get My Free Ebook

Post a comment