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Originally Posted by RunawayEngineer
I haven't heard of a team using an optical mouse,...
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WildStang and the TechnoKats collaborated on an odometer experiment using optical mice a decade ago. We determined two things. First, optical mice (at the time) were not capable of keeping up with the velocity of a typical FRC robot. Second, trying to use lenses to focus on the carpet from a few inches away in order to scale the velocity down to something the mouse sensor can handle does not work reliably. The scale varies with height and even a couple of millimeters of bounce throws off the measurements enough for them to be less accurate than a simple wheel speed encoder, even with the wheel slipping.
It's possible that modern mice are more able to track high speed motion.