ucsdhealthsciences:Think of an EyeIn this macro close-up of a human eye, two major elements are visible: the pupil and the iris. The pupil, of course, is the central aperture through which light passes to strike the retina. It appears dark because light

ucsdhealthsciences:Think of an EyeIn this macro close-up of a human eye, two major elements are visible: the pupil and the iris. The pupil, of course, is the central aperture through which light passes to strike the retina. It appears dark because light

tags: JEMEPT, A Bit Of All,

from: https://jemept.tumblr.com/post/112038308611