Humans Dominant sense

70% OF ALL SENSORY receptors are in the eye.

Keeps the surface of the eye lubricated

Protects the eye

separate the free margins of the upper and lower eyelid

The space where you can see your eyeball

contains the lacrimal gland

makes tears

drains tears into lacrimal sacs

Epithelium that covers the inner surface of the eye

Also a mucous membrane covered by a stratified squamous epithelium

Produces lubrication

The black part of the eye

very center

The colored part of the eye

Pigmented, contain the muscle that contract and change the shape of the pupil.

Two parts

Rectus Muscle

Oblique muscle

Layers of the eye

superficial to deep

Contains the Sclera, Cornea, and dense connective tissue

Physical protection and support.

Attatchment place for the eye, sclera has small blood vessels and nerves that penetrate sclera to reach inner structures

WHITE PART OF THE EYE

Dense matrix with multiple layers of collagen fibers,

avascular

focuses and bends light

hard to repair

Vascular Tunic

(uvea)

Iris, cilliary body and the Choroid

carries blood vessels and secretes aqueous humor

regulates the amount of light entering the eye

controls the shape of the lens.

Contains photoreceptors Rods and Cones

Innermost, pigmented layer

Absorbs light

Contains supporting cells and neurons that perform preliminary processing and integration of visual information.

Black and White

Highly sensitive to light

allow us to see in the dark

indistinct vision

125 million of these form a band around the periphery of the retina.

Color Vision

Three types of cones are present

(red, yellow, blue)

Different combinations provide us with different colors

One million ganglion converge here

Blind spot

Determines the wavelength of light the retinal absorbs

Works differently with different cones

Absorbs light it accumulates in the dark

Consists of retinal and opsin

Light breaks them into their separte isomers and puts them back together in the dark.

Fluid that circulates within the anterior cavity

passing from the posterior to anterior chambers.

Jelly like, helps with the shape of the eye

held to the eye by retina

The electromagnetic spectrum holds all waves of energy

Visible light is the only wave that we can physically see.

Light bouncing off an object

we see colors because of this