Precision Vision’s New Contrast Sensitivity Chart


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Product: CamBlobs
Top Line: Precision Vision is releasing CamBlobs, a simple, self-administered contrast sensitivity test for assessment and continued monitoring of retinopathies that result in progressive visual impairment.
Close Up: The CamBlobs test chart consists of 24 rows of four rectangles on a printed page. Each rectangle contains a gray disc (or “blob”) positioned randomly within it. Blobs become increasingly fainter moving down the page. Patients mark the position of as many of the blobs as they can with an “x”. The test is then scored using a transparent overlay.
“The Cam Blobs test provides a simple, easy-to-use and accurate way of measuring contrast sensitivity,” said the inventor of CamBlobs, John Robson of University of Houston College of Optometry. “Contrast sensitivity is well known to be significantly reduced in such diseases as diabetes and macular degeneration but measurement of contrast sensitivity has to date been little used to monitor progression of these diseases. Our preliminary trial of CamBlobs in patients with diabetes has allowed us not only to confirm a substantial loss of contrast sensitivity prior to observable retinopathy but also to show that increasing severity of diabetic retinopathy is accompanied by considerable further reduction in contrast sensitivity. This suggests that precise measurement of contrast sensitivity using CamBlobs might be an easy way to both detect and track the progress of this and other retinal diseases.”
Ed Kopidlansky, president of Precision Vision, noted that traditionally, testing contrast sensitivity has been difficult and time-consuming. “The CamBlobs test is intuitive and only takes two to three minutes,” he said. “Scoring takes only a minute. We believe that this is a game-changer in contrast sensitivity testing.”
Vital Stats: An introductory kit includes 20 tests with one recording form (five sets of tests A-D); the full kit includes 120 tests with 12 Recording Forms (10 sets of tests A-L).