"Diran always had weak eyes." Rohin is rummaging in a drawer in his infirmary. "The kind where he couldn't see at a distance." "But I can see!" Nikhil protests. "Yes, but - wait, I'm sure I put them in here... ah!" He turns to Nikhil with a pair of glass discs in his hand, framed by thin black metal and connected by a ribbon. "Try these on!" Nikhil flinches back, then holds the circles to his eyes - and stares on shock at the sudden crystal clarity of the world.