2-in-1 of normal spectacles and sunglasses, save the trouble to bring 2 glasses.
Reference:
http://en.wikipedia.org/wiki/Transition_lenses
http://forums.glassesadvisor.com/showthread.php?p=2135 price of transition lenses(3rd post)
http://asia.transitions.com/en/experience/Pages/TransitionsCORE.aspx
http://us.transitions.com/NR/rdonlyres/CF53A0BE-1CDC-440D-AD89-E39C800AD9AD/0/TechNotesPART4_p2328.pdf
http://www.mcga.gov.uk/c4mca/mgn_357.pdf
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