The Eye
The Eye
The eye is an organ that
can detect light and
convert sit into a electrochemical impulse that is
transferred to the brain.
External structures of the EYE
Tear gland
Caruncle
External structures of the EYE
• Tear gland:
External structures of the EYE
• Tear gland: produces tears
Anterior structures of the EYE
Anterior structures of the EYE
• Sclera:
Anterior structures of the EYE
• Sclera: white area
• Iris:
Anterior structures of the EYE
• Sclera: white area
• Iris: colored area that constricts
and dilates
• Pupil:
Anterior structures of the EYE
• Sclera: white area
• Iris: colored area that constricts
and dilates
• Pupil: hole in the iris
• Time of death
Can you TOUCH your iris?
?
Anterior structures of the EYE
• Sclera: white area
• Iris: colored area that constricts
and dilates
• Pupil: opening in the iris
• Cornea:
Anterior structures of the EYE
• Sclera: white area
• Iris: colored area that constricts
and dilates
• Pupil: opening in the iris
• Cornea: tough, clear layer that
covers the front of the eye
Anterior structures of the EYE
?
Anterior structures of the EYE
• Aqueous humor: fluid between
the cornea and lens
?
?
Anterior structures of the EYE
• Lens:
Anterior structures of the EYE
• Lens: focuses the image
?
?
Anterior structures of the EYE
• Muscles and ligaments:
Anterior structures of the EYE
• Muscles and ligaments: pull on
lens to focus image
Internal structures of the EYE
?
Internal structures of the EYE
• Vitreous humor:
Internal structures of the EYE
• Vitreous humor: thick gel that
fills the back of the eye
Internal structures of the EYE
• Vitreous humor: thick gel that
fills the back of the eye
Internal structures of the EYE
• Vitreous humor: thick gel that fills
the back of the eye
• What causes red eyes in a picture?
• Retina: inner-most layer made of
nervous tissue
• Macula: “ the yellow spot’ , portion of the
retina that contains highest concentration
of cones, no rods
Macula
• Macula: “ the yellow spot’ , portion of the
retina that contains highest concentration
of cones, no rods
• Fovea: Dimple
in the center of
Macula. High
Visual acuity here
Fovea
?
• Optic Nerve: Group of nerve cells that
transfer visual information from the retina
to the vision centers of the brain via
electrical impulses.
• Optic Nerve: Group of nerve cells that
transfer visual information from the retina
to the vision centers of the brain via
electrical impulses.
• Blind spot: Our blind spot is caused by
the absence of specialized photosensitive
cells, or photoreceptors, in the part of the
retina where the optic nerve exits the eye.
The next few slides
are just some
optical illusions
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•
Lenses
Lens of the eye
Inverted image
20/20