You are seeing this message because your Web browser does not support basic Web standards. Find out more about why this message is appearing and what you can do to make your experience on this site better.


ABOUT JAMA
Advanced Search

Welcome   | My Account | E-mail Alerts | Access Rights | Sign In


  Vol. 253 No. 12, March 22, 1985 TABLE OF CONTENTS
  JAMA
  •  Online Features
  ARTICLE
 This Article
 •Send to a friend
 • Save in My Folder
 •Save to citation manager
 •Permissions
 Citing Articles
 •Citing articles on HighWire
 •Contact me when this article is cited
 Related Content
 •Similar articles in JAMA

Ocular manifestations of gravity inversion

T. R. Friberg and R. N. Weinreb

To determine the ocular manifestations of inverting the human body into a head-down vertical position, we evaluated normal volunteers with applanation tonometry, fundus photography, fluorescein angiography, and ophthalmodynamometry. Compared with data obtained in the sitting position, the intraocular pressure more than doubled on inversion (35.6 +/- 4 v 14.1 +/- 2.8 mm Hg, n = 16), increasing to levels well within the glaucomatous range. Pressures in the central retinal artery underwent similar increases, while the caliber of the retinal arterioles decreased substantially. External ocular findings associated with gravity inversion included orbital congestion, conjunctival hyperemia, petechiae of the eyelids, excessive tearing (epiphora), and subconjunctival hemorrhage. We suggest that patients with retinal vascular abnormalities, macular degeneration, ocular hypertension, glaucoma, and similar disorders refrain from inversion altogether. Whether normal individuals will suffer irreversible damage from inversion is uncertain, but it seems prudent to recommend that prolonged periods of inverted posturing be avoided.

THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES

Effect of Posture on Blood and Intraocular Pressures in Multiple System Atrophy, Pure Autonomic Failure, and Baroreflex Failure
Singleton et al.
Circulation 2003;108:2349-2354.
ABSTRACT | FULL TEXT  

Twenty-Four-Hour Pattern of Intraocular Pressure in the Aging Population
Liu et al.
IOVS 1999;40:2912-2917.
ABSTRACT | FULL TEXT  





HOME | CURRENT ISSUE | PAST ISSUES | TOPIC COLLECTIONS | CME | SUBMIT | SUBSCRIBE | HELP
CONDITIONS OF USE | PRIVACY POLICY | CONTACT US | SITE MAP
 
© 1985 American Medical Association. All Rights Reserved.