The first camera based optical mouse was the Microsoft Intellimouse. They released various types all with the same sensor. These were superb mice for the time,

The first camera based optical mouse was the Microsoft Intellimouse. They released various types all with the same sensor. These were superb mice for the time, and still good by modern standards. Unlike a lot of competitors (even today) the sensor had pure linear response, no smoothing, no angle snapping, no forced acceleration. It was ideal for gaming. It couldn't cope with very fast movement but it was possible to poll the USB port at a higher frequency which increased the maximum speed before error. 500Hz polling was popular (supported in Linux with the usbhid module's mousepoll option, available with hacked drivers in Windows). The sensor resolution was a somewhat low 400DPI but with the display resolutions people played at back then it wasn't a major issue. Any problems with erratic movement were caused by excessively shiny surfaces. Preferring ball mice was pure superstition. All the competitive players switched once they realized how much better the optical mice were. I still use an Intellimouse today (with replaced microswitches after the originals wore out).