VEP and intraocular pressure

Ulrich, W.-D.; Bohne, B.-D.; Reimann, Jeremy; Wernecke, KD

doi:10.1007/978-94-011-6645-4_27

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…Das Ganzfeld-VEP hingegen war erst verändert, wenn größere Gesichtsfelddefekte vorlagen. Druckerhöhungen allein, selbst bis 33 mmHg, beeinflußten das VEP jedoch nicht (33). Auch andere Autoren fanden Latenzverzögeningen und Amplitudenreduktionen des Kontrast-VEP, wenn glaukomatöse Veränderungen nachweisbar waren ( I 1,30).…”

Section: U Konrrollkollrkriv Bestand Aus 38 Augengesundenunclassified

VEP und Elektroretinographie durch Musterumkehrreizung in der Frühdiagnostik des Glaucoma chronicum simplex

Lowitzsch¹,

Welt²

1991

Klin Neurophysiol

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Section: U Konrrollkollrkriv Bestand Aus 38 Augengesundenunclassified

VEP und Elektroretinographie durch Musterumkehrreizung in der Frühdiagnostik des Glaucoma chronicum simplex

Lowitzsch¹,

Welt²

1991

Klin Neurophysiol

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PR VECPs related to ciliary perfusion pressure in primary open angle glaucoma

et al. 1992

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Pr VECP studies in glaucoma patients with the IOP raised artificially by the suction cup method have recently been performed by several authors, who arrived at different results. The reason for those differences may be the changes employed. The refraction changes depend on the shape of the suction cup and the height of the artificial IOP raise. By using contact lenses and a suitably shaped suction cup refraction changes could be compensated for. Studies of the pr VECP with suction cup IOP elevation and simultaneous compensation for refraction changes by applying contact lenses were made on 17 patients with primary open angle glaucoma and 21 healthy volunteers. In healthy subjects pr VECP amplitudes were found unaltered or even slightly increased until 120 mmHg of negative pressure were reached in the cup. Beyond that range they dropped. Latencies remained unaltered over that range of negative pressures. Plotting the pr VECP amplitudes and latencies against ciliary perfusion pressure we obtained unaltered potentials over a range of ca. 20 mmHg, which we interpreted as autoregulative capacity. In the 17 glaucoma patients various degrees of impaired autoregulation were found corresponding to the progression of glaucoma damage.

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Differential effects of compression and suction ophthalmodynamometry on the scotopic blue?flash electroretinogram

1993

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Several studies have investigated the effect of elevated intraocular pressure with reduced ocular perfusion pressure on visual neural function by means of compression and suction ophthalmodynamometry. We compared the effects of nominally equivalent reductions in the ocular perfusion pressure induced by compression and suction ophthalmodynamometry retinal function as measured by flash electroretinography. Scotopic blue-flash electroretinograms were recorded in five subjects for baseline conditions; during a 40% reduction in the ocular perfusion pressure effected in a first test session by compression ophthalmodynamometry; and then in a second test session some 4 hours later by suction ophthalmodynamometry. Fifteen consecutive electroretinographic sets were recorded during scleral compression or suction, and also after compression or suction was removed. Compression and suction ophthalmodynamometry decreased the electroretinogram b-wave to different degrees; overall, the electroretinogram was attenuated more by compression than by suction ophthalmodynamometry. In the recovery phase, the group averaged b-wave quickly increased to exceed baseline after both scleral compression and suction. The trends for prolonged implicit times over the duration of the study were similar for compression and suction ophthalmodynamometry.

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VEP and intraocular pressure

Cited by 4 publications

References 7 publications

VEP und Elektroretinographie durch Musterumkehrreizung in der Frühdiagnostik des Glaucoma chronicum simplex

VEP und Elektroretinographie durch Musterumkehrreizung in der Frühdiagnostik des Glaucoma chronicum simplex

PR VECPs related to ciliary perfusion pressure in primary open angle glaucoma

Differential effects of compression and suction ophthalmodynamometry on the scotopic blue?flash electroretinogram

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