I'd love to be able to add professor-like eye glasses to my critter - the rimless kind where they ride kind of low on the nose so that you peer over them. Granny glasses, John Lennon style, shades -- all would be good choices.
I have +1'd this idea so many times.
Allow me to recapitulate.
a) Monocle.
b) Reading glasses.
c) Sunglasses of various stripes (your ray-bans, your blue lensed Lennon glasses, your punky wraparounds, etc.)
d) Transmetropolitan style red/green glasses.