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Questions and Answers
What is the primary function of the lens in the eye?
What is the primary function of the lens in the eye?
- To convert light into electrical impulses
- To maintain the eye's shape
- To focus objects at various distances (correct)
- To drain excess fluids
What consequence results from the blockage of the canal of Schlemmt?
What consequence results from the blockage of the canal of Schlemmt?
- Reduced nutrient supply to the cornea
- Impaired ability to focus objects
- Loss of the eye's shape
- Increased pressure in the eye (correct)
Which part of the eye contains many components of blood and provides nutrients to the lens?
Which part of the eye contains many components of blood and provides nutrients to the lens?
- Vitreous humor
- Sclera
- Retina
- Aqueous humor (correct)
What characteristic of the lens helps it focus objects?
What characteristic of the lens helps it focus objects?
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What is the primary role of the vitreous humor?
What is the primary role of the vitreous humor?
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What is the refractive index (n) of the aqueous humor?
What is the refractive index (n) of the aqueous humor?
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Study Notes
The Lens
- Has a variable shape, allowing it to focus objects at different distances on both its front and back surfaces
- Is more curved at the back than the front
- Has a smaller focusing power compared to the cornea due to being surrounded by substances with similar refractive indexes
- Composed of layered structures, similar to an onion, with varying refractive indexes
The Aqueous Humor
- Fills the space between the lens and the cornea
- Composed mostly of water, with a refractive index of approximately 1.33
- Continuously produced and drained through the "Canal of Schlemm" to maintain a balance
- Blockage of the drain tube can lead to increased pressure in the eye, resulting in Glaucoma
- Maintains the internal pressure of the eye at around 20mm Hg
- Provides nutrients to the non-vascularized cornea and lens, containing components similar to blood
The Vitreous Humor
- A clear, jelly-like substance filling the space between the lens and the retina
- Helps maintain the shape of the eye and is essentially permanent
The Sclera
- No significant information provided
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