IT CHANGES IT SIZE TO REGULATE THE AMOUNT OF LIGHT THAT ENTERS IN THE EYE
THOSE GLANDS CONTINUOUSLY RELEASES FLUID (CALLED TEARS) THAT CLEANS AND PROTECTS THE SURFACE OF THE EYE WHILE LUBRICATING AND MOISTURIZING IT.
THEY HELP PROTECTING THE HEALTH OF THE EYE FROM EXTERNAL AGENTS.
HELPS IN CONTROLLING THE SIZE OF THE PUPIL TO ALLOW THE CUANTITY LIGHT INTO THE EYE.
WHITE LAYER OF THE EYE COVERING MOST OF THE OUTSIDE OF THE EYE.