Electroretinograms. Screen display of the results of a normal multifocal electroretinogram (MFERG) eye test (upper frame) and one showing the pres- en

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Electroretinograms. Screen display of the results of a normal multifocal electroretinogram (MFERG) eye test (upper frame) and one showing the pres- ence of a detached retina. MFERG allows the early detection of eye diseases. During the test, the patient looks at a pattern of flickering hexagons. Light-sensitive retinal cells in their eyes change this light into electrical signals. The signals are detected by electrodes on the face and eyeli- ds, and converted into visual response maps (upper & lower right). The health of the different areas of the eye can be assessed, as each hexagon is seen by a separate bit of the retina. This test is being developed at Glasgow University, Scotland.

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Photo credit: © COLIN CUTHBERT/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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