Aqueous humor dynamics in the aging human eye

Carol B. Toris, Michael E. Yablonski, Yun Liang Wang, Carl B. Camras

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217 Scopus citations

Abstract

PURPOSE: Healthy subjects were recruited to identify normal, age- associated changes in intraocular pressure and aqueous humor dynamics. METHODS: Normal healthy subjects from two age groups were enrolled in the study: (1) those from 20 to 30 years of age (n = 51) and (2) those 60 years of age and older (n = 53). Intraocular pressure was measured by pneumatonometry, tonographic outflow facility by pneumatonography, and episcleral venous pressure by venomanometry. Aqueous flow and outflow facility were determined by a fluorophotometric technique. Uveoscleral outflow and anterior chamber volume were calculated. Results from the older group were compared with those from the younger group by means of unpaired, two-tailed t tests. RESULTS: Compared with the younger group, the older group showed significant differences as follows: smaller anterior chamber volume (160 ± 39 vs 247 ± 39 μl; mean ± SD; P < .00001), reduced aqueous flow (2.4 ± 0.6 vs 2.8 ± 0.8 μl/minute; P = .002), and reduced uveoscleral outflow (1.10 ± 0.81 vs 1.52 ± 0.81 μl/minute; P = .009). CONCLUSIONS: In the healthy aging eye, there is a reduction in the production of aqueous humor and a reduction in its drainage through the uveoscleral outflow pathway.

Original languageEnglish (US)
Pages (from-to)407-412
Number of pages6
JournalAmerican journal of ophthalmology
Volume127
Issue number4
DOIs
StatePublished - Apr 1999

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ASJC Scopus subject areas

  • Ophthalmology

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