Here is how I understand the mechanic of the optical mouse. An optical mouse uses an optical part (LED or infrared light) to capture the surface beneath. It does this process multiple times per second, then calculates how far and fast it has moved and finally transforms to a coordinate of the cursor on the screen. But why it cannot work if I lift the mouse up and move along (not touch) a surface? Is it hard to process the images in that way or is it not friendly to users?
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The farther from the surface you are, the more spread out the LED/light gets, and the harder it is for the mouse to interpret the information it’s getting back. Eventually, you reach a point where the mouse can’t tell if it’s moving or not.
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