EYEBALL
Anteroposterior stability of eyeball is provided by all except:
| A |
Suspensory ligament of the eye ball |
|
| B |
Superior oblique |
|
| C |
Superior rectus |
|
| D |
Orbital fat |
Anteroposterior stability of eyeball is provided by all except:
| A |
Suspensory ligament of the eye ball |
|
| B |
Superior oblique |
|
| C |
Superior rectus |
|
| D |
Orbital fat |
Suspensory ligament of the eye ball [Ref. Gray’s Anatomy 40/e p658; Last’s anatomy: regional and applied By Chummy S. Sinnatamby, Raymond Jack Last 11/e p417; Clinical anatomy of the eye By Richard S. Snell, Michael A. Lemp p133]
- The suspensory ligament (of Lockwood) is a part of fascial sheath encasing the eye ball. It forms a hammock stretching below the eyeball between the medial and lateral check ligaments and enclosing the inferior rectus and inferior oblique muscles of the eye.
- The ligament supports the eye, and prevents downward displacement of it.
- Gray’s 40/e p658 writes- “A continuous fascial band, the suspensory ligament of the eye, is slung like a hammock below the eye, providing sufficient support such that, even when the maxilla (forming the floor of the orbit) is removed, the eye will retain its position.”
Anteroposterior diameter of normal adult eyeball is:
| A |
25 mm |
|
| B |
24 mm |
|
| C |
23.5 mm |
|
| D |
23 mm |
Anteroposterior diameter of normal adult eyeball is:
| A |
25 mm |
|
| B |
24 mm |
|
| C |
23.5 mm |
|
| D |
23 mm |
Ans. 24 mm
Smallest diameter of the eyeball is:
| A |
Vertical |
|
| B |
Horizontal |
|
| C |
Anteroposterior |
|
| D |
More than 24 mm |
Smallest diameter of the eyeball is:
| A |
Vertical |
|
| B |
Horizontal |
|
| C |
Anteroposterior |
|
| D |
More than 24 mm |
Ans. Vertical
Circumference of an adult eyeball is:
| A |
80 mm |
|
| B |
65 mm |
|
| C |
75 mm |
|
| D |
70 mm |
Circumference of an adult eyeball is:
| A |
80 mm |
|
| B |
65 mm |
|
| C |
75 mm |
|
| D |
70 mm |
Ans. 75 mm
Volume of an adult eyeball is:
| A |
7.5 mL |
|
| B |
6.5 mL |
|
| C |
5.5 mL |
|
| D |
8 mL |
Volume of an adult eyeball is:
| A |
7.5 mL |
|
| B |
6.5 mL |
|
| C |
5.5 mL |
|
| D |
8 mL |
Ans. 6.5 mL
Weight of an adult eyeball is:
| A |
7 g |
|
| B |
9 g |
|
| C |
11 g |
|
| D |
13 g |
Weight of an adult eyeball is:
| A |
7 g |
|
| B |
9 g |
|
| C |
11 g |
|
| D |
13 g |
Ans. 7 g
Anterior segment of the eyeball includes structures lying in front of the:
| A |
Iris |
|
| B |
Crystalline lens |
|
| C |
Vitreous body |
|
| D |
Cornea |
Anterior segment of the eyeball includes structures lying in front of the:
| A |
Iris |
|
| B |
Crystalline lens |
|
| C |
Vitreous body |
|
| D |
Cornea |
Ans. Cornea
Posterior segment of the eyeball includes structures present posterior to the:
| A |
Posterior surface of the lens and zonules |
|
| B |
Iris and pupilVitreous body |
|
| C |
Anterior surface of the lens and zonules |
|
| D |
None |
Posterior segment of the eyeball includes structures present posterior to the:
| A |
Posterior surface of the lens and zonules |
|
| B |
Iris and pupilVitreous body |
|
| C |
Anterior surface of the lens and zonules |
|
| D |
None |
Ans. Posterior surface of the lens and zonules
If the length of eyeball increases by 1 mm. The net effect will be:
September 2007
| A |
Myopia of 6D |
|
| B |
Hypermetropia of 6D |
|
| C |
Myopia of 3D |
|
| D |
Hypermetropia of 3D |
If the length of eyeball increases by 1 mm. The net effect will be:
September 2007
| A |
Myopia of 6D |
|
| B |
Hypermetropia of 6D |
|
| C |
Myopia of 3D |
|
| D |
Hypermetropia of 3D |
Ans. C: Myopia of 3D
