the eye

a clear watery fluid in the anterior cavity

• cones

• aqueous humor

• ciliary body

• conjunctiva

a muscle that must relax to flatten the lens for seeing far distances

• cones

• aqueous humor

• ciliary body

• conjunctiva

centrally located receptors that sense light in 3 wavelengths (colors)

• cones

• aqueous humor

• ciliary body

• conjunctiva

a thin protective layer of epithelial tissue that lines the inner eyelids and goes over the cornea

• cones

• aqueous humor

• ciliary body

• conjunctiva

the clear thin "window" at the front of the eye through which light enters

• cornea

• fovea

• iris

• lacrimal gland

a tiny pit of cones in the retina that produce the area of our sharpest vision

• cornea

• fovea

• iris

• lacrimal gland

a pigmented ring of smooth muscle that regulates the amount of light that enters the eye

• cornea

• fovea

• iris

• lacrimal gland

secretes a dilute salt solution (tears) onto the eye surface through ducts

• cornea

• fovea

• iris

• lacrimal gland

a flexible convex structure that focuses light entering the eye onto the retina

• lens

• optic nerve

• retina

• rods

the bundle of neurons that relays neural impulses from the retina back to the brain

• lens

• optic nerve

• retina

• rods