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Questions and Answers
What does the human eye do?
What does the human eye do?
Gathers visible light, helps in visualization, and aids in depth perception.
Which part of the eye determines eye color?
Which part of the eye determines eye color?
The sclera is the colored part of the eye.
The sclera is the colored part of the eye.
False
What is the function of the cornea?
What is the function of the cornea?
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What is the retina responsible for?
What is the retina responsible for?
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What commonly occurs in Age-related Macular Degeneration (AMD)?
What commonly occurs in Age-related Macular Degeneration (AMD)?
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The _____ changes size to let light into the eye.
The _____ changes size to let light into the eye.
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What is the purpose of the hyaloid canal in the fetus?
What is the purpose of the hyaloid canal in the fetus?
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Which part of the eye helps maintain its shape?
Which part of the eye helps maintain its shape?
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What is amblyopia commonly known as?
What is amblyopia commonly known as?
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Study Notes
Human Eye Anatomy
- The human eye gathers visible light and converts it into a signal the brain can use to create images.
- It provides a field of view about 200 degrees wide and 135 degrees tall.
- The eye facilitates visualization, light, color, and depth perception.
The Structure of the Human Eye
- Sclera: The white part of the eye that provides structural support and protects the eyeball.
- Cornea: The transparent outer layer that acts as a barrier against foreign bodies and helps focus light.
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The cornea is made up of six layers:
- Epithelium: The outermost layer responsible for protection and nutrient absorption.
- Bowman’s Layer: Collagen layer that provides structural support.
- Stroma: The thickest layer, composed of water and protein, that helps with focus.
- Dua’s Layer: A thin, recently discovered layer with an unknown function.
- Descemet’s Membrane: A strong protective layer against infection and injury.
- Endothelium: The innermost layer that pumps out excess fluid to maintain clarity.
- Iris: The colored part of the eye surrounding the pupil that controls the diameter of the pupil.
- Pupil: The opening in the iris that allows light into the eye.
- Lens: Situated behind the iris and in front of the vitreous body, it focuses light onto the retina.
- Vitreous body: A clear gel that fills the space between the lens and retina, maintaining the retina's shape.
- Retina: The light-sensitive tissue at the back of the eye that converts light into nerve signals, which are then transmitted to the brain via the optic nerve.
- Retinal blood vessels: Supply blood to the retina, with the central retinal artery supplying the inner retina and the choriocapillaris supplying the outer layers.
- Hyaloid Canal: A remnant structure that appears to have no function in adults, but was present in fetuses to supply the developing lens.
- Optic Nerve: Contains millions of nerve fibers that carry visual messages to the brain.
Common Disorders of the Human Eye
- AMD (Age-related Macular Degeneration): A disorder causing blurring in central vision due to damage to the macula in the retina.
- Amblyopia (Lazy Eye): Poor vision in one eye due to the brain not recognizing the sight from that eye.
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Description
Test your knowledge of human eye anatomy and its structure. Learn about the various parts of the eye, including the sclera, cornea, and more. See how these components work together to provide us with vision.
