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IMPLANTABLE MINIATURIZED TELESCOPE (IMT) FOR LOW-VISION

VisionCare has developed and tested the first Implantable Miniaturized Telescope (IMT) for low vision. A small optical device with a configuration of a Galilean telescope is implanted in place of the crystalline lens. The IMT is inserted and held in position using a surgical procedure similar to a standard intraocular lens. Together with the cornea, the IMT acts as a telephoto lens that is in focus at a distance of 50 cm. For closer and further distance views, eyeglasses are needed. A nominal magnification of 3.05 is achieved with the IMT. Even though higher relative distance magnification power may be provided with additional low diopter eyeglasses, distance vision may be provided also with negative lenses in the spectacles. The main advantage of the IMT over a spectacle or head-mounted low-vision telescope is the flexibility afforded by the ability to scan reading materials and other images using natural eye scanning movements. The fact that the magnification is in the eye completely eliminates the increased speed of motion and vestibular conflict, which impedes the use of other head-mounted low-vision telescopes. The IMT is designed for monocular use in patients with bilateral acuity loss due to macular diseases and other retinal pathologies. Prototype telescopes were built and tested to meet the specifications for 3.05 magnification, a 6.6o visual field (20o on retina), and excellent optical quality. The effective field of view of the IMT is much wider than an equivalent head mounted telescope, as scanning with eye movements only is required. Preliminary results of clinical trials are reported here.