Optic nerve head circulation in untreated ocular hypertension

AIMS--The laser Doppler technique was used to compare the capillary blood speed measured at localised sites of the optic nerve head in stable, untreated ocular hypertensive patients with that measured in healthy normal subjects. The stereophotogrammetric technique was also used to measure the retina...

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Bibliographic Details
Published in:British journal of ophthalmology 1995-12, Vol.79 (12), p.1088-1092
Main Authors: Feke, G T, Schwartz, B, Takamoto, T, Fujio, N, Konno, S, Goger, D G, Nangia, V
Format: Article
Language:English
Subjects:
Adult
Aged
Biological and medical sciences
Blood Flow Velocity
Capillaries - physiopathology
Female
Glaucoma and intraocular pressure
Humans
Laser-Doppler Flowmetry
Male
Medical sciences
Middle Aged
Ocular Hypertension - physiopathology
Ophthalmology
Optic Nerve - blood supply
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Summary:AIMS--The laser Doppler technique was used to compare the capillary blood speed measured at localised sites of the optic nerve head in stable, untreated ocular hypertensive patients with that measured in healthy normal subjects. The stereophotogrammetric technique was also used to measure the retinal nerve fibre layer thickness at the disc margin in the eyes of the patients. METHODS--Doppler broadening measurements were made at superior and inferior temporal disc sites in 18 eyes of 10 ocular hypertensive patients and in 12 eyes of seven age and sex-matched normal subjects. RESULTS--On average, Doppler broadening and, hence, capillary blood speed were significantly higher (p = 0.018) in the patients than in the normal subjects. The largest values of Doppler broadening in the patients were measured at sites adjacent to the thinnest retinal nerve fibre layer. Linear regression analysis showed a significant inverse relation (p = 0.0004) between Doppler broadening and nerve fibre layer thickness in left eyes, and a nearly significant relation (p = 0.06) in right eyes. At temporal sites of the optic nerve head there is a compensatory relation between a thinning nerve fibre layer and a locally increasing blood supply to the optic nerve head. CONCLUSION--Together with previous observations of fluorescein filling defects in similar patients, these results indicate that there is spatial heterogeneity of blood flow in the optic nerve head in stable, untreated ocular hypertensive patients.
ISSN:0007-1161
1468-2079
DOI:10.1136/bjo.79.12.1088