Podcast
Questions and Answers
What is the primary function of the lens?
What is the primary function of the lens?
- Refraction of light (correct)
- Absorption of light
- Scattering of light
- Dispersion of light
How does the lens thin along the equator?
How does the lens thin along the equator?
- By elongating the fibers
- By reducing in thickness (correct)
- By reducing in transparency
- By increasing in density
What is the source of energy required for cellular metabolism and replication in the lens?
What is the source of energy required for cellular metabolism and replication in the lens?
- Lipid breakdown
- Anaerobic glycolysis (correct)
- Protein synthesis
- Aerobic respiration
Which factor prevents oxidative damage and has an anti-cataract effect in the lens?
Which factor prevents oxidative damage and has an anti-cataract effect in the lens?
What is the main function of hexokinase in lens metabolism pathways?
What is the main function of hexokinase in lens metabolism pathways?
Where is the metabolic activity mainly concentrated in the lens?
Where is the metabolic activity mainly concentrated in the lens?
What is the effect of aging on lens metabolism?
What is the effect of aging on lens metabolism?
What leads to the formation of free radicals in the lens?
What leads to the formation of free radicals in the lens?
What is a common risk factor for developing a posterior subcapsular cataract?
What is a common risk factor for developing a posterior subcapsular cataract?
Which nutrient source contributes to lens metabolism, apart from the surrounding aqueous humor?
Which nutrient source contributes to lens metabolism, apart from the surrounding aqueous humor?
What is the main function of the primary lens fibers?
What is the main function of the primary lens fibers?
Which part of the lens is responsible for containing primary lens cells and elongating anteriorly as fibers?
Which part of the lens is responsible for containing primary lens cells and elongating anteriorly as fibers?
What is the purpose of the zonules of Zinn in relation to the lens?
What is the purpose of the zonules of Zinn in relation to the lens?
What is the main characteristic of lens fibers as they age?
What is the main characteristic of lens fibers as they age?
What is the main role of the lens vesicle during development?
What is the main role of the lens vesicle during development?
What structure within the eye undergoes a change in shape due to ciliary muscle contraction, leading to accommodation?
What structure within the eye undergoes a change in shape due to ciliary muscle contraction, leading to accommodation?
Which region of the lens has the thickest capsule?
Which region of the lens has the thickest capsule?
What is a notable characteristic of primary lens fibers during development?
What is a notable characteristic of primary lens fibers during development?
What is the correct sequence of divisions in the lens from the earliest to the latest?
What is the correct sequence of divisions in the lens from the earliest to the latest?
What happens to the lens fibers with age?
What happens to the lens fibers with age?
Where is the germinal zone located in the lens?
Where is the germinal zone located in the lens?
What are the main components of lens fibers?
What are the main components of lens fibers?
What causes a change in lens power during accommodation?
What causes a change in lens power during accommodation?
Which region of the lens has the thickest capsule?
Which region of the lens has the thickest capsule?
What is responsible for attaching the lens to the ciliary body?
What is responsible for attaching the lens to the ciliary body?
What forms the basis of the lens nucleus and cortex?
What forms the basis of the lens nucleus and cortex?
"Wieger's ligament" is associated with which part of the lens?
"Wieger's ligament" is associated with which part of the lens?
"Accommodation" in the eye refers to a change in which part of the eye?
"Accommodation" in the eye refers to a change in which part of the eye?
What is the primary protector against oxidative damage in the lens?
What is the primary protector against oxidative damage in the lens?
What is the primary stimulus that initiates the accommodative mechanism?
What is the primary stimulus that initiates the accommodative mechanism?
Which type of cataract is characterized by center opacification and susceptibility to oxidative damage due to depleted glutathione?
Which type of cataract is characterized by center opacification and susceptibility to oxidative damage due to depleted glutathione?
What is the primary source of nutrients for maintaining lens metabolism?
What is the primary source of nutrients for maintaining lens metabolism?
Which ion's increased permeability in aging lenses disrupts the ion balance?
Which ion's increased permeability in aging lenses disrupts the ion balance?
What metabolic process is predominantly responsible for ATP production in the lens?
What metabolic process is predominantly responsible for ATP production in the lens?
Which type of cataract is most influenced by long-term use of high-dose steroids?
Which type of cataract is most influenced by long-term use of high-dose steroids?
Which enzyme converts glucose to sorbitol in lens metabolism pathways when hexokinase is not present?
Which enzyme converts glucose to sorbitol in lens metabolism pathways when hexokinase is not present?
'Decrease in soluble lens proteins' is a characteristic of age changes in the lens, primarily affecting which proteins?
'Decrease in soluble lens proteins' is a characteristic of age changes in the lens, primarily affecting which proteins?
'Decline of Glutathione' are presumed causative factors for which type of cataract?
'Decline of Glutathione' are presumed causative factors for which type of cataract?
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