NDLI: Effect of acute intraocular pressure challenge on rat retinal and cortical function.

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Effect of acute intraocular pressure challenge on rat retinal and cortical function.

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Effect of acute intraocular pressure challenge on rat retinal and cortical function.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Tsai, Tina I. Vingrys, Algis J. Bui, Bang V.
Description	Country affiliation: Australia Author Affiliation: Tsai TI ( Department of Optometry and Vision Sciences, University of Melbourne, Victoria, Australia.)
Abstract	PURPOSE: The global or gross response index of visual performance measured from the eye does not necessarily translate to global responses measured from the brain. A better understanding of this relationship would facilitate the monitoring of disease models that affect the visual pathway. We consider whether rod- and cone-retino-cortical-pathways are equally affected by acute IOP elevation. METHODS: Acute, stepwise IOP elevation (10, 30, 40, 50, 60, 70 mm Hg) was induced in anesthetized dark- (N = 8) and light-adapted pigmented rats (N = 6). Electroretinogram (ERG) and visual evoked potentials (VEP) were simultaneously measured after 10 minutes at each step. Relative amplitudes (treated/baseline, %) as a function of IOP level were described with a cumulative normal function. RESULTS: Our results showed decline in scotopic and photopic ERGs with IOP elevation. Photopic ERG responses were less sensitive to IOP challenge than scotopic ERG responses. Despite significant reductions of ganglion cell-mediated waveforms at 70 mm Hg, the VEP showed only subtle decreases in amplitude. Intraocular pressure elevation produced similar effects on rod- and cone-mediated VEP waveforms. CONCLUSIONS: We show that cone signals are less sensitive than rod ERGs to acute IOP challenge. Also, retinal signals are more sensitive than are cortical signals to IOP stress, suggesting that cortical processing may act to salvage reductions expected from attenuated retinal output.
ISSN	01460404
e-ISSN	15525783
Journal	Investigative Opthalmology & Visual Science
Issue Number	2
Volume Number	55
Language	English
Publisher	Association for Research in Vision and Ophthalmology
Publisher Date	2014-02-20
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Electroretinography Evoked Potentials, Visual Physiology Intraocular Pressure Ocular Hypertension Physiopathology Retina Visual Cortex Animals Color Vision Dark Adaptation Night Vision Photic Stimulation Rats, Long-evans Research Support, Non-u.s. Gov't Discipline Ophthalmology
Content Type	Text
Resource Type	Article
Subject	Ophthalmology Sensory Systems Cellular and Molecular Neuroscience

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