Podcast
Questions and Answers
What is the primary function of the cornea in the eye?
What is the primary function of the cornea in the eye?
- To serve as the major refracting body (correct)
- To provide nutrients to the retina
- To maintain intraocular pressure
- To focus light onto the crystalline lens
Which statement about the crystalline lens is true?
Which statement about the crystalline lens is true?
- It helps bring rays of light to focus on the retina (correct)
- It has a higher index of refraction than the cornea
- It is composed of non-elastic tissue
- It is responsible for the formation of the aqueous humor
Which layer of the eye is primarily responsible for night vision?
Which layer of the eye is primarily responsible for night vision?
- Macula
- Rods (correct)
- Ciliary muscles
- Cones
What is the role of the choroid in the eye?
What is the role of the choroid in the eye?
During accommodation for clearer near vision, what happens to the ciliary muscles?
During accommodation for clearer near vision, what happens to the ciliary muscles?
Flashcards
Corneal Epithelium
Corneal Epithelium
The outermost layer of the cornea; highly regenerative, responsible for protecting the eye from the outside world.
What is the cornea's function?
What is the cornea's function?
The transparent, dome-shaped front part of the eye that helps focus light; its curvature is significant for vision.
What is the function of the aqueous humor?
What is the function of the aqueous humor?
A clear, watery fluid that fills the space between the cornea and the lens; maintains pressure inside the eye, keeps the cornea moist, and provides nutrients.
What is the function of the vitreous humor?
What is the function of the vitreous humor?
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What is the macula's function?
What is the macula's function?
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Study Notes
Globe
- The cornea is the major refracting body
- It has an approximate diopter of 43.00 D
- The index of refraction is 1.37
- The cornea has 5 layers: epithelium (outermost, highly regenerative), Bowman's membrane, stroma (90% of total cornea thickness), Descemet's membrane, and endothelium (innermost)
Aqueous Humor
- The index of refraction is 1.34
- It keeps the cornea moist
- It provides nutrients to the cornea
- It maintains intraocular pressure
Vitreous Humor
- The index of refraction is 1.33
Crystalline Lens
- It has an approximate diopter of 17.00 D
- The index of refraction is 1.42
- It focuses light rays onto the retina
- It is normally elastic and flexible
Accommodation
- Ciliary muscles relax: Zonules of Zinn increase tension, lens becomes thinner = clearer distance vision
- Ciliary muscles contract: Zonules of Zinn decrease tension, lens becomes thicker = clearer near vision
Retina
- The innermost layer of the eye
- Its goal is to focus light onto the retina
- It contains photoreceptor cells: rods (night vision, peripheral vision, black and white) and cones (day vision, detail, color)
- The macula is the central area of the retina, providing sharpest vision
Choroid
- A blood-rich layer underneath the retina
- It provides nutrients to the retina and other parts of the eye
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