-Protects inner parts of eyeball

-Gives shap to the eyeball

-Keeps eyeball firm by contributing pressure 

-Allows nutrients to circulate

-Maintains convex shape of cornea

-Keeps eyeball firm by contributing pressure (slightly)

-Holds retina flush against choroid, so that the retina provides even surface for reception of clear images

-Reduce internal refraction of light

-Presence of blood vessels provides nourishment for the eye

-Holds lens in position

-Tension of fibers help change shape of lens

-Recives and transmit visual input

-Made up of rods and cones

       -Rods detect shape and movement

       -Can function in dim light

       -Do not distinguish colours

       -Cones provide colour vision

       -Requires more light to stimulate cones