Abstract: A body-mountable display device includes an image source for producing an image, an image transmission device including at least one optically-transmissive fiber, the image transmission device being mountable on the body of a user, projection optics for receiving and relaying the image carried by the image transmission device, and a display for receiving the image from the image transmission device and projecting the image to at least one person. Embodiments of the invention are of significantly reduced size and weight, significantly reduced power consumption and thermal output, and significantly increased durability and reliability. Embodiments of the invention also are more aesthetically pleasing in appearance. Corresponding method embodiments provide similar advantages.

Abstract: Manually portable reflectance spectrometer and method of detection of absorption and reflection of light, wherein the visible and invisible (infrared) light is derived from LEDs. A phototransistor or photodiode measures the light reflected by the surface being measured, and a digital converter ADC translates the phototransistor's output into a digital format display. Three or more LEDs blue, aqua, green, yellow, orange, crimson, red and infrared provide a range of readings across the visible and infrared spectrum.