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?
Which statement about the crystalline lens is true?
Which statement about the crystalline lens is true?
Which layer of the eye is primarily responsible for night vision?
Which layer of the eye is primarily responsible for night vision?
What is the role of the choroid in the eye?
What is the role of the choroid in the eye?
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During accommodation for clearer near vision, what happens to the ciliary muscles?
During accommodation for clearer near vision, what happens to the ciliary muscles?
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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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Description
Test your knowledge on the structure and function of the human eye. This quiz covers the various components such as the cornea, aqueous humor, vitreous humor, crystalline lens, and retina. Understand their roles in vision and how they interact in the process of accommodation.
