Eye Structure and Function

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Fat

Opening: levator palpebrae superioris

Closing: orbicularis oculi

Cornea transplant

“Relaxed”

Fluid filled spaces

• Aqueous humor

• Vitreous humor

Contains:

•rods:-receptors for night vision

•Cones: receptors for day vision and color

•Macula lutea

•Fovea centralis

Presbyopia/Myopia

• Farsightedness: can’t see close up

• Nearsightedness: can’t see far away

Colorblindness• X linked recessive trait that

causes a problem with the color-sensing granules (pigments) in cones.

• If just one pigment is missing, you may have trouble telling the difference between red and green. This is the most common type of color blindness.

• If a different pigment is missing, you may have trouble seeing blue-yellow colors. People with blue-yellow color blindness usually have problems identifying reds and greens, too

• most severe form of color blindness is achromatopsia

• rare condition in which a person can’t see any color, so they see everything in shades of gray.

• lazy eye, nystagmus (small, jerky eye movements), severe light sensitivity, and extremely poor vision.

Astigmatism• optical defect in which

vision is blurred due to the inability of the optics of the eye to focus a point object into a sharp focused image on the retina.

• due to an irregular or toric curvature of the cornea or lens.

Glaucoma

Increased amount of pressure in the eye

damage to the optic nerve is due to increased pressure in the eye, also known as intraocular pressure (IOP).

Cataracts

A cataract is a clouding of the lens in the eye that affects vision. Most cataracts are related to aging.By age 80, more than half of all Americans either have a cataract or have had cataract surgery.

Retinal detachment

Conjunctivitis

Diplopia

lasik