Optometry mcq and ophthalmology mcq part : 07

01. In a simple microscope lens used is __________.

1. biconvex✓
2. biconcave
3. plano convex
4. cylindrical

02. Reciprocal of focal length in metres is known as the ______ of a lens.

1. focus
2. power✓
3. power of accommodation
4. far point

03. A convex lens is called _________.

1. converging lens✓
2. diverging lens
3. both converging and diverging lens
4. refracting lens

04. A positive magnification greater than unity indicates _____________________.

1. real image
2. virtual image✓
3. neither real not virtual image
4. distorted image

05. The power of a convex lens of focal length 50 cm is ______.

1. + 2D✓
2. +50D
3. +1/50 D
4. +0.5D

06. The focal length of a lens whose power is -1.5 D is _______.

1. -66.66 cm✓
2. -3/2 m
3. +66.66cm
4. -1.5 m

07. Real images formed by single convex lenses are always ________________.

1. on the same side of the lens as the object
2. inverted✓
3. erect
4. smaller than the object

08. An object is placed 12 cm from a convex lens whose focal length is 10 cm. The image must be.

1. virtual and enlarged
2. virtual and reduced in size
3. real and reduced in size
4. real and enlarged✓

09. A concave mirror give real image with same size if positioned at

1.  Infinity
2. Optical centre
3. Focus point
4. Centre of curvature✓

10. The of AR coating is based on the property

1. Total internal reflection
2. Refraction
3. Diffraction
4. Interference✓

11. A standard size (1.2mm) pinhole may correct refractive error upto

1. 1D
2. 3D✓
3. 10D
4. Any power

12. Types of visual acuity include all except

1. Minimum visible
2. Minimum separable
3. Maximum resolvable✓
4. Hyper acuity

13. When correcting hypermetropia, if Plus lens placed away from eye, the reqired power to correct will be

1. Lower✓
2. Higher
3. Same
4. Higher in case of high hypermetropia

Moving lens away from the eye increases effective plus power

 In a hyperope, far point is behind eye, Moving lens forward moves its focal point forward. So the Lens is further away from far point of eye, To match far point of eye, we need longer focal length (lower power) plus lens

Similarly, Moving lens toward eye decreases effective plus power

The closer the lens is to the eye, the greater the power required to correct the same amount of hyperopia. To remember this, remember about aphakia, aphakia spectacle correction is around +10D and IOL around +20D

14. Distometer is used for measuring

1. Visual acuity
2. Power of lens
3. Vertex distance✓
4. Contrast sensitivity

15. In accommodation, convexity of the lens

1. Increase
2. Decrease
3. No change
4. None

16. In hypermetropia far point of the eye is

1. Real and infront of the eye
2. Virtual and infront of the eye
3. Real and behind the eye
4. Virtual and behind the eye✓

17. Minimum plus correction required for clear vision at distance shows

1. Total hypermetropia
2. Absolute hypermetropia
3. Latent hypermetropia
4. Manifest hypermetropia

18. Transpose +4.00 +2.00 x 105

1. +6.00 -2.00 x 105
2. +2.00 +2.00 x 15
3. +6.00 -2.00 x 15✓
4. +4.00 -2.00 x 15

19. Spherical equivalent of -1.00 + 2.00 x 135

1. +1.00
2. 0.0✓
3. -1.00
4. +1.5

20. While doing retinoscopy, At the neutralization point, far point of eye is at

1. Infinity
2. Behind the eye
3. Anywhere depending on power of the eye
4. At the position of retinoscope✓

Far point of eye may be at any point depending on the power of the eye, in retinoscopy we are bringing that to the position of retinoscpe.

Any eye including emmetropic, At the neutralization point the far point will be on the peephole of retinoscpe. Or simply, with that neutralizing power eye is intentionally made myopic with far point at position of retinoscpe. That is then corrected as distance correction in PMT.

21. Impact-resistance is less for

1. Glass✓
2. CR39
3. Polycarbonate
4. Plastic

22. Arden grating is used for evaluation of

1. Distance vision
2. Colour vision
3. Contrast sensitivity✓
4. Diplopia

23. Optokinetic nystagmus test is a

1. Detection acuity test
2. Recognition acuity test
3. Direction identification test
4. Resolution acuity test✓

OKN, PLT, VER etc are Resolution acuity tests

Snellen's E and Landolt's broken ring tests are direction identification tests.

24. Which etiologic type of aniseikonia is easily correctable

1. Optical aniseikonia✓
2. Retinal aniseikonia
3. Cortical aniseikonia
4. All are equally easy

25. All are features of convergence spasm except

1. Intermittent diplopia
2. Blurring of vision
3. Mydriasis✓
4. Induced myopia

26. Magnification of +40D lens is

1. 4x
2. 10x✓
3. 20x
4. 40x

Magnification=D/4

27. All are features of image formed by a plane mirror except

1. Same size
2. Real✓
3. Laterally inverted
4. Same distance from mirror Image is virtual

28. The Vistech chart is used for evaluation of

1. Distance vision
2. Near vision
3. Colour vision
4. Contrast sensitivity✓

29. Best optical treatment option for correcting irregular astigmatism

1. Spectacles
2. Contact lens✓
3. Intra ocular lens
4. Polarization lens

30. If axial length is increased, IOL power will

1. Increase
2. Decrease✓
3. Remain same
4. None

31. In the hypermetropic eye, the second principal focus lies

1. Behind the Retina✓
2. Infront of the Retina
3. On the Retina
4. At infinity

32. The jack-in-the-box phenomenon is observed in Aphakia correction using

1. Spectacle✓
2. Contact lens
3. IOL
4. Al

33. Transverse keratotomy is used for correcting

1. Myopia
2. Hypermetropia
3. Astigmatism
4. Presbyopia

34. In retinoscopy, swirling reflex is seen in

1. High astigmatism
2. Keratoconus
3. Aphakia
4. IOL dislocation

35. Trachoma is a

1. Viral infection
2. Bacterial infection✓
3. Fungal infection
4. Allergic reaction

Trachoma is a disease caused by bacterium Chlamyida trachomatis which is spread by poor hygiene, contaminated water, and houseflies.

36. Rupture in the Descemet's membrane seen in

1. K. conus
2. K.globus
3. Buphthalmos
4. All of the above✓

37. The pathology of snow blindness involves the

1. cornea✓
2. iris
3. Macula
4. optic disc

38. The most diagnosis sign of anterior uveitis is

1. Aqueous flare
2. KPs✓
3. Miosis
4. Raised IOP

39. Distichiasis is

1. An extra row of lashes✓
2. Misalignment of lashes
3. Absence of lashes
4. White lashes

40. Epidemic keratoconjunctivitis is caused by

1. dryness
2. allergens
3. adenovirus✓
4. bacteria Moraxella

When only the cornea is inflamed, it is called keratitis; when only the conjunctiva is inflamed, it is called conjunctivitis. When both conjunctiva and cornea is inflamed, it is known as keratoconjunctivitis.