Dorzolamide, visual function and ocular hemodynamics in normal-tension glaucoma

Alon Harris, Oliver Arend, Larry Kagemann, Melanie Garrett, Hak Sung Chung, Bruce Martin

Research output: Contribution to journalArticlepeer-review

79 Scopus citations


The purpose of this study was to determine how a topical carbonic anhydrase inhibitor, dorzolamide, alters visual function and ocular blood flow in persons with normal-tension glaucoma. Eighteen normal tension glaucoma patients, after washout of other ocular medications, were treated for four weeks with 2% dorzolamide, three times daily. A control group of eleven other normal-tension glaucoma patients received placebo eye drops. Patients were studied before treatment, and after two and four weeks of treatment. Each study included assessment of central visual function (contrast sensitivity), intraocular pressure (IOP), and several aspects of ocular hemodynamics, including measures of retinal arteriovenous passage time, retinal arterial and venous diameters, and flow velocities in the ophthalmic, central retinal, and posterior ciliary arteries. Dorzolamide significantly reduced lOP at two and four weeks (each p<0.01), and at the same time increased contrast sensitivity at both three and six cycles per degree (each p<0.05). Neither of these variables changed significantly in the control group. Dorzolamide also accelerated retinal arteriovenous passage time of fluorescein dye, at constant retinal arterial and venous diameters (p<0.05), but failed to change flow velocities in any retrobulbar vessel. The ability of dorzolamide to improve contrast sensitivity in persons with normal-tension glaucoma may be related to either IOP reduction or altered ocular perfusion.

Original languageEnglish
Pages (from-to)189-197
Number of pages9
JournalJournal of Ocular Pharmacology and Therapeutics
Issue number3
StatePublished - Jun 1999
Externally publishedYes


Dive into the research topics of 'Dorzolamide, visual function and ocular hemodynamics in normal-tension glaucoma'. Together they form a unique fingerprint.

Cite this