MCQ - Refractive Errors and Accommodation

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1. At birth eye is usually:
A. Hypermetropic
B. Myopic
C. Emmetropic
D. Aniseikonic

2. The most common type of refractive error is:
A. Hypermetropia
B. Myopia
C. Astigmatism
D. None of the above

3. One millimeter decrease in axial length of the eyeball leads to hypermetropia of:
A. 6 dioptres
B. 2 clioptres
C. 3 dioptres
D. 4 dioptres

4. One millimeter increase in the radius of curvature of cornea leads to hypermetropia of:
A. 3 dioprres
B. 4 dioptres
C. 5 dioprres
D. 6 dioptres

5. In an aphakic eye the anterior focal point from the anterior surface of cornea is about:
A. 15mm
B. 21 mm
C. 23 mm
D. 31mm

6. In an aphakic eye posterior focal point from the back of cornea is about:
A. 23mm
B. 25mm
C. 31 mm
D. 21 mm

7. The standard power of an intraocular lens implanted in the posterior chamber is:
A. 18 dioptres
B. 20 dioptres
C. 23 dioptres
D. 25 dioptres

8. An aphake wearing aphakic glasses will most commonly notice:
A. Pincushion distortion
B. Spherical aberration
C. Barrel distortion
D. Chromatic aberration

9. Because of circle of least diffusion, the distant vision is comparatively good in:
A. Simple myopic astigmatism
B. Compound myopic astigmatism
C. Mixed astigmatism
D. Compound hypermetropic astigmatism

10. A difference in the size of two retinal images which can be well tolerated is:
A. 2%
B. 3%
C. 5%
D. 10%

1 1. In Against-the-rule astigmatism:
A. Vertical meridian is more curved than the horizontal
B. Horizontal meridian is more curved than the vertical
C. Both meridia are equally curved
D. None of the above

12. Radial keratotomy corrects myopia by causing:
A. Steepening of cornea
B. Flattening of cornea
C. Shortening of cornea
D. Pin-hole effect

13. Range of accommodation is the distance between:
A. Far point and near point of the eye
B. The eyes and the near point
C. The eyes and the far point
D. The retina and the near point

14. Causes of premature presbyopia include all of the following except:
A. General debility
B. Primary open-angle glaucoma
C. Uncorrected myopia
D. Premature sclerosis of the lens

15. During accommodation, there occurs decrease in the radius of curvature of the:
A. Anterior surface of the lens
B. Posterior surface of the lens
C. Both surfaces of the lens
D. None of the above

16. Near point of the eye varies with:
A. The age of the patient
B. The static refraction of the eye
C. Both of the above
D. None of the above

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