Optical mice have several benefits over wheeled mice: No moving parts means less wear and a lower chance of failure. There's no way for dirt to get inside the mouse and interfere with the tracking sensors. Increased tracking resolution means smoother response

The CMOS sensor won't be able to recognize any variations in the light pattern. That's why optical mice don't work well on highly reflective surfaces. They're much better suited for a non-glossy surface, like a mousepad. A laser is much more powerful than an LED light