Optometry and ophthalmology mcq part: 23

1. Anteroposterior diameter of normal adult
eyeball is:

1. A. 25 mm
2. B. 24 mm
3. C. 23.5 mm
4. D. 23 mm

2. Smallest diameter of the eyeball is:

1. A. Vertical
2. B. Horizontal
3. C. Anteroposterior
4. D. More than 24 mm

3. Circumference of an adult eyeball is:

1. A. 80 mm
2. B. 65 mm
3. C. 75 mm
4. D. 70 mm

4. Volume of an adult eyeball is:

1. A. 7.5 mL
2. B. 6.5 mL
3. C. 5.5 mL
4. D. 8 mL

5. Weight of an adult eyeball is:

1. A. 7 g
2. B. 9 g
3. C. 11 g
4. D. 13 g

6. Anterior segment of the eyeball includes structures lying in front of the:

1. A. Iris
2. B. Crystalline lens
3. C. Vitreous body
4. D. Cornea

7. Posterior segment of the eyeball includes structures present posterior to the:

1. A. Posterior surface of the lens and zonules
2. B. Iris and pupil
3. C. Vitreous body
4. D. Anterior surface of the lens and zonules

8. Diameter of an adult crystalline lens is:

1. A. 5–6 mm
2. B. 7–8 mm
3. C. 9–10 mm
4. D. 11–12 mm

9. Thickness of the adult crystalline lens is about:

1. A. 2.5 mm
2. B. 3.5 mm
3. C. 4.25 mm
4. D. 5 mm

10. Radius of curvature of the anterior surface of an adult crystalline lens with accommodation at rest is:

1. A. 7 mm
2. B. 10 mm
3. C. 8 mm
4. D. 9 mm

11. Capsule of the crystalline lens is thinnest at:

1. A. Anterior pole
2. B. Posterior pole
3. C. Equator
4. D. None of the above

12. Infantile nucleus of the crystalline lens refers to the nucleus developed from:

1. A. 3 months of gestation to till birth
2. B. Birth to one year of age
3. C. Birth to puberty
4. 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:

1. A. Embryonic nucleus
2. B. Fetal nucleus
3. C. Infantile nucleus
4. D. All of the above

14. The youngest lens fibres are present in:

1. A. Central core of the lens nucleus
2. B. Outer layer of the nucleus
3. C. Deeper layer of the cortex
4. D. Superficial layer of the cortex

15. Schwalbe’s line forming part of the angle of anterior chamber is the prominent end of:

1. A. Sclera
2. B. Descemet’s membrane of cornea
3. C. Anterior limit of trabecular meshwork
4. D. Posterior limit of trabecular meshwork

16. In a normal adult person the depth of anterior chamber in the centre is about:

1. A. 2.5 mm
2. B. 3 mm
3. C. 3.5 mm
4. D. 4 mm

17. Is a sweat gland:

1. A. Gland of Moll
2. B. Gland of Zeis
3. C. Mebomian gland
4. D. All of the above

18. The layer of the cornea once destroyed does not regenerate is:

1. A. Epithelium
2. B. Bowman’s membrane
3. C. Descemet’s membrane
4. D. All of the above

19. All of the following are true about corneal endo-thelium except:

1. A. Cell density is about 3000 cells/mm2 at birth
2. B. Corneal decompensation occurs when cell count is decreased by 50 percent
3. C. Endothelial cells contain active pump mechanism
4. D. Endothelium is best examined by specular microscopy

20. Adult size of the cornea is attained by the age of:

1. A. 2 years
2. B. 3 years
3. C. 5 years
4. D. 9 years

21. Sclera is weakest at the level of:

1. A. Macula
2. B. Equator
3. C. Insertion of extraocular muscles
4. D. Ora serrata

22. The definitive colour of the iris depends upon the:

1. A. Anterior limiting layer
2. B. Stroma
3. C. Anterior pigmented epithelium
4. D. Posterior pigmented epithelium

23. Circulus iridis major is formed by the anastomosis  of:

1. A. Long posterior ciliary arteries with short posterior ciliary arteries
2. B. Anterior ciliary arteries with short posterior ciliary arteries
3. C. Long posterior ciliary arteries with anterior ciliary arteries
4. D. Long posterior arteries with anterior conjunctival arteries

24. Layer of non-pigmented epithelium of the ciliary body is the forward continuation of the:

1. A. Pigment epithelium of the retina
2. B. Sensory retina
3. C. Internal limiting membrane of the retina
4. D. Bruch’s membrane of the choroid

25. The number of ciliary processes is about:

1. A. 20–30
2. B. 50–60
3. C. 70–80
4. D. 90–100

26. All of the following are true about circulus 
arteriosus minor except:

1. A. It receives contribution from anterior ciliary 
2. arteries and long posterior ciliary arteries
3. B. It is an arterial and venous plexus
4. C. It lies near the pupillary margin
5. 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:

1. A. Vitreous base
2. B. Optic disc
3. C. Posterior surface of the lens
4. D. Foveal region

28. Diameter of the optic disc is:

1. A. 1.5 mm
2. B. 2.5 mm
3. C. 3.5 mm
4. D. 5 mm

29. Diameter of the macula lutea is:

1. A. 1.5 mm
2. B. 3.5 mm 
3. C. 4.5 mm 
4. D. 5.5 mm

30. Diameter of fovea centralis is:

1. A. 0.5 mm
2. B. 1.0 mm
3. C 1.5 mm
4. D. 2.5 mm

31. Henle’s layer refers to the thickened outer plexiform layer in the region of:

1. A. Foveola
2. B. Foveal region
3. C. Parafoveal region
4. D. Paramacular region

32. Major retinal vessels are present in:

1. A. Between the vitreous and internal limiting
2. membrane
3. B. The nerve fibre layer
4. C. The inner plexiform layer
5. D. The inner nuclear layer

33. Optic nerve consists of axons of:

1. A. Ganglion cells
2. B. Bipolar cells
3. C. Rods and cones
4. D. All of the above

34. Optic nerve fibres once cut, do not regenerate because they are not covered by:

1. A. Myelin sheath
2. B. Neurilemma
3. C. Both of the above
4. D. None of the above

35. Neurons of first order for visual sensations are:

1. A. Rods and cones
2. B. Bipolar cells
3. C. Ganglion cells
4. D. None of the above

36. Neurones of third order for visual sensations lie in:

1. A. Layer of bipolar cells
2. B. Layer of ganglion cells
3. C. Lateral geniculate body
4. D. Visual cortex

37. The longest extraocular muscle is:

1. A. Superior oblique
2. B. Inferior oblique
3. C. Superior rectus
4. D. Inferior rectus

38. The shortest extraocular muscle is:

1. A. Superior oblique
2. B. Inferior oblique
3. C. Superior rectus
4. D. Inferior rectus

39. The posterior end of which muscle insertion lies near the macula ?

1. A. Inferior oblique
2. B. Superior oblique
3. C. Superior rectus
4. D. Inferior rectus

40. The nerve which has the longest intracranial course is:

1. A. Fourth cranial nerve
2. B. Third cranial nerve
3. C. Sixth cranial nerve
4. D. Fifth cranial nerve