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Electrophysiology

The ocular electrophysiology is a group of tests based on bioelectricity generated by the photoreceptors and other retinal cells.
The objective of these tests is to evaluate the integrity of the visual pathways from the photoreceptors to the visual cortex in the brain.

The Clínica de Oftalmología de Cali offers this service of Ocular Electrophysiology with a state-of-the-art device called Reti Port Scan 21 of German technology and using the latest developments in standardization by the International Society of Ocular Electrophysiology, which allows tests to be performed as Multifocal Electroretinogram useful for tracking and the premature detection of retinal toxicity in patients undergoing treatment with chloroquine and hydroxychloroquine.
We also perform the Electroretinogram, used to evaluate the functionality of the surface layers of the retina which helps us to know the extent of retinal toxicity. It involves the measurement of the central retinal response to a constant stimulus of light boxes with alternating black and white.

It is performed by placing two electrodes in the lower conjunctiva without interfering with the visual axis. Two electrodes are then attached around each eye and a neutral electrode on the forehead. The test is performed on both eyes without dilating the pupil and proper refraction. The patient is placed one meter away from the stimulation screen which has a central fixation point.

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