3-button optical mouse?

Does this exist?

All optical mice I’ve seen have a wheel in the middle. This can of course be used as the middle mouse button, but I think it’s quite uncomfortable. In CAD applications I’m pressing the middle button DOWN (never scroll), so I prefer the standard, old fashoned 3-button, no-wheel mouse…with optical technology.

Does anyone know where to find one?

Are far as I know, no an optical three button mouse does not exist. I too have been searching for this for quite some time. Your best options are either get an old three button ball style mouse, find a mouse with a scroll wheel that feels comfortable and try to get used to it, or get a 4-5 button mouse and program one of the side buttons to be a middle click. Best of luck.