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.
The other most common type of navigation device is the handheld GPS. Used for hiking, cycling, geocaching, or any other outdoor pursuit, it is also based on technology that has been subsumed by the smartphone. Yet it also has a different set of strengths that the smartphone is less adept at competing with.