Transcript Eye Structure and Function

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
• most severe form of color
causes a problem with the colorblindness is achromatopsia
sensing granules (pigments) in
cones.
• rare condition in which a
person can’t see any color, so
• If just one pigment is missing,
they see everything in shades
you may have trouble telling the
of gray.
difference between red and
green. This is the most common
• lazy eye, nystagmus (small,
type of color blindness.
jerky eye movements), severe
• If a different pigment is missing,
light sensitivity, and extremely
you may have trouble seeing
poor vision.
blue-yellow colors. People with
blue-yellow color blindness
usually have problems
identifying reds and greens, too
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