Optometry and ophthalmology mcq part: 23
1. Anteroposterior diameter of normal adult
eyeball is:
- A. 25 mm
- B. 24 mm
- C. 23.5 mm
- D. 23 mm
2. Smallest diameter of the eyeball is:
- A. Vertical
- B. Horizontal
- C. Anteroposterior
- D. More than 24 mm
3. Circumference of an adult eyeball is:
- A. 80 mm
- B. 65 mm
- C. 75 mm
- D. 70 mm
4. Volume of an adult eyeball is:
- A. 7.5 mL
- B. 6.5 mL
- C. 5.5 mL
- D. 8 mL
5. Weight of an adult eyeball is:
- A. 7 g
- B. 9 g
- C. 11 g
- D. 13 g
6. Anterior segment of the eyeball includes structures lying in front of the:
- A. Iris
- B. Crystalline lens
- C. Vitreous body
- D. Cornea
7. Posterior segment of the eyeball includes structures present posterior to the:
- A. Posterior surface of the lens and zonules
- B. Iris and pupil
- C. Vitreous body
- D. Anterior surface of the lens and zonules
8. Diameter of an adult crystalline lens is:
- A. 5–6 mm
- B. 7–8 mm
- C. 9–10 mm
- D. 11–12 mm
9. Thickness of the adult crystalline lens is about:
- A. 2.5 mm
- B. 3.5 mm
- C. 4.25 mm
- D. 5 mm
10. Radius of curvature of the anterior surface of an adult crystalline lens with accommodation at rest is:
- A. 7 mm
- B. 10 mm
- C. 8 mm
- D. 9 mm
11. Capsule of the crystalline lens is thinnest at:
- A. Anterior pole
- B. Posterior pole
- C. Equator
- D. None of the above
12. Infantile nucleus of the crystalline lens refers to the nucleus developed from:
- A. 3 months of gestation to till birth
- B. Birth to one year of age
- C. Birth to puberty
- D. One year of age to 3 years of age
13. The lens fibres meet around the Y-shaped sutures in which part of nucleus of the crystalline lens:
- A. Embryonic nucleus
- B. Fetal nucleus
- C. Infantile nucleus
- D. All of the above
14. The youngest lens fibres are present in:
- A. Central core of the lens nucleus
- B. Outer layer of the nucleus
- C. Deeper layer of the cortex
- D. Superficial layer of the cortex
15. Schwalbe’s line forming part of the angle of anterior chamber is the prominent end of:
- A. Sclera
- B. Descemet’s membrane of cornea
- C. Anterior limit of trabecular meshwork
- D. Posterior limit of trabecular meshwork
16. In a normal adult person the depth of anterior chamber in the centre is about:
- A. 2.5 mm
- B. 3 mm
- C. 3.5 mm
- D. 4 mm
17. Is a sweat gland:
- A. Gland of Moll
- B. Gland of Zeis
- C. Mebomian gland
- D. All of the above
18. The layer of the cornea once destroyed does not regenerate is:
- A. Epithelium
- B. Bowman’s membrane
- C. Descemet’s membrane
- D. All of the above
19. All of the following are true about corneal endo-thelium except:
- A. Cell density is about 3000 cells/mm2 at birth
- B. Corneal decompensation occurs when cell count is decreased by 50 percent
- C. Endothelial cells contain active pump mechanism
- D. Endothelium is best examined by specular microscopy
20. Adult size of the cornea is attained by the age of:
- A. 2 years
- B. 3 years
- C. 5 years
- D. 9 years
21. Sclera is weakest at the level of:
- A. Macula
- B. Equator
- C. Insertion of extraocular muscles
- D. Ora serrata
22. The definitive colour of the iris depends upon the:
- A. Anterior limiting layer
- B. Stroma
- C. Anterior pigmented epithelium
- D. Posterior pigmented epithelium
23. Circulus iridis major is formed by the anastomosis of:
- A. Long posterior ciliary arteries with short posterior ciliary arteries
- B. Anterior ciliary arteries with short posterior ciliary arteries
- C. Long posterior ciliary arteries with anterior ciliary arteries
- D. Long posterior arteries with anterior conjunctival arteries
24. Layer of non-pigmented epithelium of the ciliary body is the forward continuation of the:
- A. Pigment epithelium of the retina
- B. Sensory retina
- C. Internal limiting membrane of the retina
- D. Bruch’s membrane of the choroid
25. The number of ciliary processes is about:
- A. 20–30
- B. 50–60
- C. 70–80
- D. 90–100
26. All of the following are true about circulus
arteriosus minor except:
- A. It receives contribution from anterior ciliary
- arteries and long posterior ciliary arteries
- B. It is an arterial and venous plexus
- C. It lies near the pupillary margin
- D. It is the seat of formation of aqueous humour
27. The strongest attachment of the vitreous body to the surrounding structures is at the level of:
- A. Vitreous base
- B. Optic disc
- C. Posterior surface of the lens
- D. Foveal region
28. Diameter of the optic disc is:
- A. 1.5 mm
- B. 2.5 mm
- C. 3.5 mm
- D. 5 mm
29. Diameter of the macula lutea is:
- A. 1.5 mm
- B. 3.5 mm
- C. 4.5 mm
- D. 5.5 mm
30. Diameter of fovea centralis is:
- A. 0.5 mm
- B. 1.0 mm
- C 1.5 mm
- D. 2.5 mm
31. Henle’s layer refers to the thickened outer plexiform layer in the region of:
- A. Foveola
- B. Foveal region
- C. Parafoveal region
- D. Paramacular region
32. Major retinal vessels are present in:
- A. Between the vitreous and internal limiting
- membrane
- B. The nerve fibre layer
- C. The inner plexiform layer
- D. The inner nuclear layer
33. Optic nerve consists of axons of:
- A. Ganglion cells
- B. Bipolar cells
- C. Rods and cones
- D. All of the above
34. Optic nerve fibres once cut, do not regenerate because they are not covered by:
- A. Myelin sheath
- B. Neurilemma
- C. Both of the above
- D. None of the above
35. Neurons of first order for visual sensations are:
- A. Rods and cones
- B. Bipolar cells
- C. Ganglion cells
- D. None of the above
36. Neurones of third order for visual sensations lie in:
- A. Layer of bipolar cells
- B. Layer of ganglion cells
- C. Lateral geniculate body
- D. Visual cortex
37. The longest extraocular muscle is:
- A. Superior oblique
- B. Inferior oblique
- C. Superior rectus
- D. Inferior rectus
38. The shortest extraocular muscle is:
- A. Superior oblique
- B. Inferior oblique
- C. Superior rectus
- D. Inferior rectus
39. The posterior end of which muscle insertion lies near the macula ?
- A. Inferior oblique
- B. Superior oblique
- C. Superior rectus
- D. Inferior rectus
40. The nerve which has the longest intracranial course is:
- A. Fourth cranial nerve
- B. Third cranial nerve
- C. Sixth cranial nerve
- D. Fifth cranial nerve
Tags:
Optometry MCQ