Podcast
Questions and Answers
What is the refractive power of the cornea alone?
What is the refractive power of the cornea alone?
- 22 diopters
- 44 diopters (correct)
- 55 diopters
- 33 diopters
Which of the following contributes to the causes of corneal transparency?
Which of the following contributes to the causes of corneal transparency?
- High water content in the cornea
- Presence of myelin sheath in the corneal nerve fibers
- Irregular arrangement of corneal collagen bundles
- Lack of vascularization in the cornea (correct)
What is the approximate diameter of the cornea?
What is the approximate diameter of the cornea?
- 13 mm
- 11 mm (correct)
- 12 mm
- 10 mm
Why is the refractive index the same in all corneal layers?
Why is the refractive index the same in all corneal layers?
Which vitamin helps prevent keratinization of the cornea?
Which vitamin helps prevent keratinization of the cornea?
In maintaining corneal transparency, which pump is responsible for expelling fluid into the aqueous humor?
In maintaining corneal transparency, which pump is responsible for expelling fluid into the aqueous humor?
What is the range of normal intraocular pressure (IOP) in humans?
What is the range of normal intraocular pressure (IOP) in humans?
Which structure separates the vitreous from the lens and allows slight bulging of the lens during accommodation?
Which structure separates the vitreous from the lens and allows slight bulging of the lens during accommodation?
What is the main function of the vitreous humor in the eye?
What is the main function of the vitreous humor in the eye?
In the eye, what structure holds the lens in place behind the iris?
In the eye, what structure holds the lens in place behind the iris?
Which of the following is NOT a function of the vitreous humor?
Which of the following is NOT a function of the vitreous humor?
What is the refractive index of the central part of the lens?
What is the refractive index of the central part of the lens?
Which drug increases the excitability of the third cranial nerve nucleus?
Which drug increases the excitability of the third cranial nerve nucleus?
What is the diagnostic sign of morphine poisoning related to the pupil?
What is the diagnostic sign of morphine poisoning related to the pupil?
Which drug causes marked dilation and cycloplegia of the pupil for a long time?
Which drug causes marked dilation and cycloplegia of the pupil for a long time?
What is the mechanism of action of prostigmine?
What is the mechanism of action of prostigmine?
In which condition does mydriasis occur?
In which condition does mydriasis occur?
What are the changes that occur during accommodation in the eye?
What are the changes that occur during accommodation in the eye?
What is the physiological blind spot in the visual field caused by?
What is the physiological blind spot in the visual field caused by?
What is the central part of the macula lutea called?
What is the central part of the macula lutea called?
What is found in the fovea centralis that contributes to its high visual acuity?
What is found in the fovea centralis that contributes to its high visual acuity?
Which ion is continuously pumped from the inner segment of rods and cones to flow inside again at the outer segment?
Which ion is continuously pumped from the inner segment of rods and cones to flow inside again at the outer segment?
What term is used to describe the movements of Na+ from the inner segment to enter into the outer segment of rods?
What term is used to describe the movements of Na+ from the inner segment to enter into the outer segment of rods?
What causes continuous release of an inhibitory chemical transmitter when the eye is not exposed to light?
What causes continuous release of an inhibitory chemical transmitter when the eye is not exposed to light?
What enzyme is responsible for transforming cGMP into 5'GMP in photoreceptors?
What enzyme is responsible for transforming cGMP into 5'GMP in photoreceptors?
What is the result of hyperpolarization in photoreceptors?
What is the result of hyperpolarization in photoreceptors?
Which type of receptor potential is generated by photoreceptors in the retina?
Which type of receptor potential is generated by photoreceptors in the retina?
What leads to the re-synthesis of cGMP and the subsequent opening of Na+ channels in photoreceptors?
What leads to the re-synthesis of cGMP and the subsequent opening of Na+ channels in photoreceptors?
Which cell type is mainly responsible for color vision in the retina?
Which cell type is mainly responsible for color vision in the retina?
How does the sense of discrimination of various wavelengths that constitute the visible spectrum occur?
How does the sense of discrimination of various wavelengths that constitute the visible spectrum occur?
