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Exercise and reversed pupillary block in pigmentary glaucoma
P K Jensen1, O Nissen, S V Kessing
1Eye Department, National University Hospital, Copenhagen, Denmark.
American Journal of Ophthalmology
|July 1, 1995
Summary
Exercise significantly increased iris concavity in pigmentary glaucoma patients, causing pigment dispersion. This effect was reversed after laser iridotomy, suggesting a link between ocular pulse, aqueous flow, and iris movement.
Area of Science:
- Ophthalmology
- Physiology
Background:
- Pigmentary glaucoma is characterized by pigment dispersion.
- Iris concavity changes can influence intraocular pressure.
Purpose of the Study:
- To investigate the effect of exercise on iris contour in patients with pigmentary glaucoma.
- To understand the mechanism of exercise-induced pigment dispersion.
Main Methods:
- Ultrasound biomicroscopy was used to examine iris contour.
- Two patients with pigmentary glaucoma underwent exercise testing (bicycle ergometry).
Main Results:
- Ten minutes of bicycle exercise led to a marked increase in iris concavity.
- Following Nd:YAG laser iridotomy, the iris remained flat during a repeat exercise test.
Conclusions:
- Exercise-induced increases in ocular pulse may augment aqueous flow, leading to increased iris concavity.
- This iris movement, combined with reverse pupillary block, can cause pigment dispersion in susceptible individuals.