the eye: structure
DESCRIPTION
The Eye: Structure . 1. Sclera . White part of the eye Is made of tough tissue Protects the inner workings of the eye and gives the eye its shape. 2. Aqueous Humor. A clear, watery fluid Circulates in the front part of the eye, maintaining a constant pressure inside the eye. . 3. Cornea . - PowerPoint PPT PresentationTRANSCRIPT
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The Eye: Structure
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1. Sclera White part
of the eye Is made of
tough tissue
Protects the inner workings of the eye and gives the eye its shape
![Page 3: The Eye: Structure](https://reader036.vdocuments.net/reader036/viewer/2022062315/56816582550346895dd82504/html5/thumbnails/3.jpg)
![Page 4: The Eye: Structure](https://reader036.vdocuments.net/reader036/viewer/2022062315/56816582550346895dd82504/html5/thumbnails/4.jpg)
2. Aqueous Humor
A clear, watery fluid
Circulates in the front part of the eye, maintaining a constant pressure inside the eye.
![Page 5: The Eye: Structure](https://reader036.vdocuments.net/reader036/viewer/2022062315/56816582550346895dd82504/html5/thumbnails/5.jpg)
3. Cornea
The curved, clear, outer surface
Covers the iris and pupil
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4. Pupil Is the opening in
the center of the iris
The size of the pupil: determines the
amount of light entering the eye
controlled by circular muscles
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5. Iris
The colored part of the eye
Made of circular muscles
Controls the size of the pupil
![Page 8: The Eye: Structure](https://reader036.vdocuments.net/reader036/viewer/2022062315/56816582550346895dd82504/html5/thumbnails/8.jpg)
6. Lens
A clear convex lens
Is responsible for focusing light to form an image on the retina
Can change shape to focus on nearby and distant objects
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7. Vitreous Humor
A clear, jelly-like substance
Fills the eye behind the lens
Holds the structures of the eye in place
Maintains the shape of the eye
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8. Optic Nerve
A thick bundle made of millions of neurons
Carries visual information from the retina to the brain.
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9. Retina
A thin, translucent, light-sensitive tissue made of specialized cells called rods and cones
Receives images formed by the lens
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10. Optic Disc
The point where the optic nerve enters the retina
NOT sensitive to light
Known as the “blind spot”
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11. Tapetum
A shiny layer that lines the area behind the retina of many animals
Helps make animal eyes visible in the dark
Allows them to see better at night
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Vision
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Corrective Lenses (Glasses & Contacts)
Near Sighted
Far Sighted
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Color Blindness
Your eyes have special cells called rods and cones
Rods – Light sensitive
Cones – Color Sensitive
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Color Blindness
There are three main kinds of color vision defects. Red-green color vision defects are the most common. This type occurs in men more than in women. The other major types are blue-yellow color vision defects and a complete absence of color vision.
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Color Blindness
Most of the time, color blindness is genetic. There is no treatment, but most people adjust and the condition doesn't limit their activities.
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LASIK
1. Create a flap of corneal tissue
2. Remodel the cornea using the laser
3. Reposition the flap
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