 |
|
Recovery of Spatial Vision Following Shunting for Hydrocephalus
Milan E. Tytla, PhD;
J. Raymond Buncic, MD
Arch Ophthalmol. 1990;108(5):701-704.
Abstract
• Individuals with papilledema due to intracranial hypertension often exhibit a loss of contrast sensitivity confined to low spatial frequency (coarse detail), which can disappear following treatment of the intracranial hypertension. The basis of the initial loss may be revealed by the rate of sensitivity recovery. We monitored the contrast sensitivity of seven patients immediately before and after surgical treatment in which a shunt was placed for intracranial hypertension. Compared with normal controls, the 13 of 14 eyes with papilledema exhibited the characteristic preshunt loss of sensitivity. For the first 3 days after shunt placement, sensitivity remained approximately equal to preshunt levels. By postshunt days 4 through 6, sensitivity rapidly normalized and remained normal for up to 1 year. Based on the rate and pattern of sensitivity normalization, we conclude that the initial loss represents an interaction of axoplasmic stasis with ischemia at the level of the optic nerve.
Author Affiliations
From the Department of Ophthalmology, The Hospital for Sick Children, Toronto, Canada.
Footnotes
Accepted for publication on October 30, 1989.
Read before the annual meetings of the Association for Research in Vision and Ophthalmology, Sarasota, Fla, May 4, 1989, and the Canadian Ophthalmological Society, Calgary, Canada, June 27, 1989.
Reprints to Department of Ophthalmology, The Hospital for Sick Children, 555 University Ave, Toronto, Ontario, Canada, M5G 1X8 (Dr Tytla).
 CiteULike  Connotea  Delicious  Digg  Facebook  Reddit  Technorati  Twitter
What's this?
|
