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GDx VCC offers visualization of detailed localized defects of RNFL

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BARCELONA, Spain — The latest prototype of the GDx scanning laser polarimeter obtains high quality images in most eyes in as little as 3 minutes per patient, according to information presented here at the International Glaucoma Symposium.

H.G. Lemij, MD, PhD, said the GDx with variable corneal compensation (VCC), a polarized laser beam prototype developed by Laser Diagnostic Technologies Inc., was created to compensate for any form of birefringence of the anterior segment. The images made with the VCC show a similarity with red-free fundus photographs, which have always served as a standard for assessing nerve fiber layer morphology in vivo, he said. With the automated VCC capability, nerve fiber layer morphology is more quantifiable. With VCC, localized nerve fiber layer defects are much better detected versus standard fixed compensation, Dr. Lemij said.