Podcast
Questions and Answers
Which part of the lens invaginates to form the lens pit?
Which part of the lens invaginates to form the lens pit?
- Optic vesicles
- Lens placode (correct)
- Surface ectoderm
- Lens vesicle
On what day those the lens form during embryology?
On what day those the lens form during embryology?
- 25th day
- 26th day
- 27th day (correct)
- 28th day
What differentiates into primary lens cells and elongates anteriorly as fibers, toward the anterior lens epithelium to fill up the lumen?
What differentiates into primary lens cells and elongates anteriorly as fibers, toward the anterior lens epithelium to fill up the lumen?
- Surface ectoderm
- Posterior lens epithelium (correct)
- Optic vesicles
- Lens placode
What do young outer fibers of the lens contain?
What do young outer fibers of the lens contain?
Where is the germinative zone located?
Where is the germinative zone located?
Which part of the lens forms the fetal nucleus?
Which part of the lens forms the fetal nucleus?
What do Y inverted sutures denote during slit lamp examination?
What do Y inverted sutures denote during slit lamp examination?
What is the main mass of the lens composed of?
What is the main mass of the lens composed of?
What can cause a change in the shape of the lens, increasing its dioptric power for accommodation?
What can cause a change in the shape of the lens, increasing its dioptric power for accommodation?
What part of the eye is attached to the anterior vitreous face by Wieger’s ligament?
What part of the eye is attached to the anterior vitreous face by Wieger’s ligament?
What is the anterior radius of curvature of the lens?
What is the anterior radius of curvature of the lens?
Where are Y inverted sutures seen during slit lamp examination?
Where are Y inverted sutures seen during slit lamp examination?
What is the primary function of the lens?
What is the primary function of the lens?
What is the source of the energy required for cellular metabolism and cellular replication in the lens?
What is the source of the energy required for cellular metabolism and cellular replication in the lens?
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 effect of age changes on soluble lens proteins (alpha crystallins)?
What is the effect of age changes on soluble lens proteins (alpha crystallins)?
Which type of cataract is located just beneath the posterior capsule and impacts vision early?
Which type of cataract is located just beneath the posterior capsule and impacts vision early?
What are the risk factors for cataract development according to the text?
What are the risk factors for cataract development according to the text?
What is the primary cause of blindness according to the text?
What is the primary cause of blindness according to the text?
Which of the following mechanisms is presumed to be causative of cataracts?
Which of the following mechanisms is presumed to be causative of cataracts?
What does a nuclear cataract mainly consist of?
What does a nuclear cataract mainly consist of?
What is the primary effect of ascorbic acid in relation to oxidative stress of the lens?
What is the primary effect of ascorbic acid in relation to oxidative stress of the lens?
What does anaerobic glycolysis serve as a source for in lens metabolism?
What does anaerobic glycolysis serve as a source for in lens metabolism?
What is the impact of age changes on glutathione activity?
What is the impact of age changes on glutathione activity?
What is the refractive power of the unaccommodated lens?
What is the refractive power of the unaccommodated lens?
Which part of the lens contains a higher concentration of crystallins?
Which part of the lens contains a higher concentration of crystallins?
What is the approximate thickness of the thinnest region of the lens at the posterior pole?
What is the approximate thickness of the thinnest region of the lens at the posterior pole?
Which part of the lens is responsible for secretion of the anterior capsule throughout life?
Which part of the lens is responsible for secretion of the anterior capsule throughout life?
What is the name of the elastic acellular envelope that allows passage of small molecules into and out of the lens?
What is the name of the elastic acellular envelope that allows passage of small molecules into and out of the lens?
Which part of the lens contains fibers formed after sexual maturation?
Which part of the lens contains fibers formed after sexual maturation?
What is the primary function of the zonules of Zinn?
What is the primary function of the zonules of Zinn?
What happens to the diameter of the ciliary ring in an emmetropic eye when viewing a distant object?
What happens to the diameter of the ciliary ring in an emmetropic eye when viewing a distant object?
During accommodation, what happens to the anterior chamber of the eye?
During accommodation, what happens to the anterior chamber of the eye?
What change occurs in the lens shape during accommodation?
What change occurs in the lens shape during accommodation?
What do lens fibers lose as they become compacted in the nucleus?
What do lens fibers lose as they become compacted in the nucleus?
Where do zonules of Zinn arise from?
Where do zonules of Zinn arise from?
