The Eye

The EyeThe eye is an organ that

can detect light and convert sit into a electro-chemical impulse that is transferred to the brain.

External structures of the EYE

Caruncle

Tear gland

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:

• 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

Anterior structures of the EYE

Can you TOUCH your iris?

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• 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

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• Aqueous humor: fluid between the cornea and lens

Anterior structures of the EYE

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• Lens:

Anterior structures of the EYE

• Lens: focuses the image

Anterior structures of the EYE

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• Muscles and ligaments:

Anterior structures of the EYE

• Muscles and ligaments: pull on lens to focus image

Anterior structures of the EYE

Internal structures of the EYE

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• 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

Internal structures of the EYE

• 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

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• 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

• Lenses

• Lens of the eye

• Inverted image

• 20/20