Tinted Lenses Question?

[Jenn1]

Ok so i ordered some new glasses at my opticians and asked about tinted lenses by asking the young assistant and asked whether the darker the lense the more or better protection from the suns rays or light sensitivity. The response was, 'not neccessarily', so i opted for the medium tints as i didnt fancy having the dark colours on glasses for regular indoor or outdoor wear. Is she correct or does colour matter when it comes to sun/light protection?

I decided against the transition lenses since some friends say theirs change colour at stupid times. Havent received them yet so will be interesting to see what they are like or how effective.