Eye Anatomy - Mrs. Blackmon's Science Blackboard

Eye Anatomy - Mrs. Blackmon's Science Blackboard

Eye Anatomy Eye Structure enclosed and cushioned by fat and walls of bony orbit composed of

3 layers = tunics filled with fluid = humors to maintain shape lens for focusing divides eye into

anterior and posterior chambers 3 Layers: Tunics 1. Fibrous Tunic outermost 2 parts

1. sclera white of the eye Tough Anchors muscles 1. Fibrous tunic 2 parts 1. Sclera

2. Cornea clear window lacks blood vessels easy to transplant nutrition via

diffusion from aqueous humor fluid behind 2. Vascular Tunic 3 regions middle 1. choroid (coat)

vascular pigmented posterior part absorbs light and

prevents scattering 2. Vascular Tunic 3 regions 1. choroid 2. ciliary body encircles lens made of smooth

muscle - ciliary muscles controls lens shape 2. Vascular Tunic 3 regions

1. choroid 2. ciliary body folds secrete aqueous humor - ciliary processes suspensory ligaments hold lens up 2. Vascular Tunic

3. iris visible colored area contain melanin amount and distribution = different colors 2. Vascular Tunic 3. iris

made of muscles that control pupil size - regulating light pupil is hole in center of iris pupillary reflex also responds to interests or emotions boredom or repugnant material = constriction

of pupil appealing subject matter, problem solving = dilates 3. Sensory tunic = retina 2 layers

1. outer is pigmented to absorb light 2. inner layer transparent photoreceptor neurons (rods and cones)

Detached Retina separation of pigmented from transparent Warning signs include: seeing many new flashing lights showers of many floaters

blurred vision a curtain-like blockage 3. Sensory tunic = retina Fovea optic disc where optic nerve

leaves eye blind spot off center optic nerve has blood vessels in center Photoreceptors

Rods dim light black and white just outside fovea peripheral vision Cones

Photoreceptors bright light color vision Optic Disc concentrated in

center fovea centralis nervous flow is opposite ( = light) light

light ganglion cells bipolar neurons photoreceptors back up and to optic nerve Chambers and Humors Posterior Chamber with Vitreous Humor transmits light

supports back surface of lens supports eye shape vitreous humor thick and clear lasts a lifetime Anterior Chambers

with Aqueous Humor chamber between cornea and lens formed in ciliary processes watery constantly produced and drained via canals

of Schlemm Glaucoma if canals are blocked unable to drain Glaucoma

if canals are blocked unable to drain = nerve cells gradually destroyed by pressure treated with drugs Lens

Lens biconvex

transparent flexible becomes less elastic with age Cataracts lens clouding

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