I usually take 'spectacles' to mean ordinary day-wear glasses, which have assorted frame shapes.
Cycling spectacles are shaped differently, as the wind around the face is usually different on a bike - unless you live somewhere that regularly has wind speeds of >30kph, say - and almost always head-on ...
Cycling/sports specs are also usually lighter, with different arms, as they usually have rubber stuff to grip the side of yer hied. The grip is more on the side of the head than the rear of the ear.
Personally, I have ordinary as-near-to-aviator-type-as-Boots-had-for-least-money varifocals for cycling/ manual working and they are OK - bought for strength rather than 'style'. I can see the far distance, read road signs, see my cycle 'puter ~40cm and ~75cm from my face, depending on which bike I am on (~40 is my 'hamster barred 'bent). The wind does make my eyes water when going a bit quickly though and I'm also put off by the high prices of specialist glasses. I think I need to reconsider my viewing 'requirements'; do I really need to be able to see the radio mast on the top of the hill across the Forth?
I have grey Transition lenses too - but wouldn't have them again.
Being reactive to UV light, they darken too much on overcast days, so everything appears very gloomy, until I look over the top and think 'Oh, it's not really that bad' but it just
looks depressing.