The Optomap allows for a more comfortable retinal exam. Panoramic 200 Retinal Image - Click for hi resolution image. The top image to the right compares the doctor's view of your eye through an undilated pupil with an instrument called a direct ophthalmoscope (inner ring).
Mobile device. A mobile device (or handheld computer) is a computing device small enough to hold and operate in the hand. Typically, the device has a either flatscreen display with a small numeric keypad or alphanumeric keyboard, or a touchscreen providing a virtual keyboard and buttons (icons) on-screen.
More types of electronic devices include answering machines, beepers or pagers, defibrillators, video displays, dongles, doublers, multiplexes, trackballs, artificial pacemakers and monitors. An answering machine is a device that answers the telephone and records messages. A generator is an electronic device used for producing a signal voltage. A digital scanner, or image scanner, is an electronic device that generates a digital representation of an image for data input to a computer. A trackball is an electronic device consisting of a routable ball in housing.