The Magnifying Glass Gets an Electronic Twist
Published: May 30, 2008PEOPLE who lose part of their sight to macular degeneration, diabetes or other diseases may now benefit from some new technology. Several portable video devices that enlarge print may help them make the most of their remaining vision.
Swipe one of the devices over an airline ticket, or point it at a medicine bottle on a shelf, and all of the fine print is blown up and displayed in crisp letters on a screen.
Sturdy desktop video-based systems that magnify print have long been available, but lightweight, portable devices have become popular only in the past decade, as the size of consumer electronics products in general has shrunk. The new hand-held models typically weigh 9 ounces or less and can enlarge the print on closeby or more distant objects: users can pass the magnifier over a menu in a dimly lit restaurant, for example, or aim it at a grocery display on a store aisle.
The tiny, high-resolution video camera within the device captures the image, and the electronics bolster the contrast in the display, making it easier to read words on the monitor.
Dr. Bruce P. Rosenthal, chief of low-vision programs at Lighthouse International in Manhattan, which offers services for people with vision loss, said the portable magnifiers, with their built-in illumination and powerful electronics, have many advantages over traditional optical devices like magnifying glasses. “Optical devices can’t increase the contrast like these devices,” he said. “Loss in contrast causes as many problems as loss of visual acuity.”
Electronics in the new devices can make black print darker, or switch black lettering on white to white lettering on black — which some people with macular degeneration prefer.
