Originally posted by renorenal:
[b]NEW MYSTERY
When you sleep snuggly at night in your dark comfy room, your lil
brother decides to give you a nasty wake-up call... he sneaked into
your room and switch on all your bright room lights.
As you open your eyes to see what is going on your eyes hurt and
you reflexively close your eye...
Why? [/b]
interesting...has tis gotta do w e sleeping part or e eyes part?
(okie after reading hisoka's reply i think i know e ans)
my guess: e eyes...could it be due to dark adaptation? (it usually
takes 30mins to adapt to e dark..therefore, we feel like blindbats
whenever we are late for movies in the cinema). since we close our
eyes (or in this case when we sleep), we are v used to darkness,
hence e threshold is v low to light. therefore e human eye is able
to spot light even a few miles away in dark surroundings.
transition to light adaptation: now that e lights are suddenly
lighted, it will cause an overwhelming reaction in the eyes, as the
rods now are totally bleached (compared to the high levels of
rhodopsin in the dark, now are all used up), and now no longer
function.
to adapt to light it will take at least 1min. to restore a level of
rhodopsin (for the rods and cones to function), maybe e first
reflex is to constrict the pupil size, if it doesnt work, then the
eyes close to shut light from going in..
