eye

alter size of pupil so can see objects near or far

large in low small small in bright light

transparent layer that protect the eye; refract light

transparent disc that adjusts in siz- bends light so it hits fovea in back of retina

sphincter muscles attached to iris that have ciliary fibers attached to lens. control thickness of lens

accomodation

change focal length of lens by changing curvature of eye lens

white of eye

blood supply to eye

• light sensitive rods and cones
• cones-register color
• rods- black and white

densely packed rods and cones

part of brain; blind spot

• contains more rods than cones
• light must hit fovea for full acuity
• sensitive to detail
• projects to rest of retina and bain

inability to see far onjects clearly

inability to see near object clearly