ophthalmology MCQ only

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Categories: Health

Language: English

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The latest Messages 6

2021-12-26 22:04:19

Sebaceous cell carcinoma of the lids arises from:
....
source Review of OPHTHALMOLOGY Quick Text Review & MCQs Sixth Edition AK Khurana book

Anonymous Quiz

31%

A. Meibomian gland

22%

B. Sebaceous gland of eyebrows

C. Caruncle

40%

D. All of the above

482 voters2.9K viewsDr Atef Ahmad, 19:04

Open / Comment

2021-12-26 21:59:11

All of the following are pre-cancerous conditions of the lids except:

... source Review of OPHTHALMOLOGY Quick Text Review & MCQs Sixth Edition AK Khurana book

Anonymous Quiz

35%

A. Naevi

23%

B. Solar keratosis

28%

C. Xeroderma pigmentosa

14%

D. Carcinoma in situ

465 voters2.8K viewsDr Atef Ahmad, 18:59

Open / Comment

2021-12-26 16:26:28

Photorefractive keratectomy:

The source Ophthalmology Review Second Edition Editor-in-chief Myron Yanoff book

Anonymous Quiz

A. uses the 248 nm ultraviolet laser.

21%

B. gives excellent results from myopia of 3 to 9 diopters.

25%

C. acts by steepening differentially the corneal meridians.

13%

D. uses a treatment zone of 4.5 mm.

32%

E. has results comparable to those of radial keratotomy or LASIK in low myopia.

308 voters2.7K viewsDr Atef Ahmad, 13:26

Open / Comment

2021-12-26 16:26:28

About two-thirds of refraction of the eye occurs at:

.. The source Ophthalmology Review Second Edition Editor-in-chief Myron Yanoff book

Anonymous Quiz

27%

A. the anterior epithelial surface.

B. Bowman’s membrane.

37%

C. the air-tear interface.

16%

D. the level of Descemet’s membrane.

11%

E. the nodal point of the eye.

409 voters2.7K viewsDr Atef Ahmad, 13:26

Open / Comment

2021-12-24 17:21:57

The Nd:YAG laser:

... The source Ophthalmology Review Second Edition Editor-in-chief Myron Yanoff book

Anonymous Quiz

13%

A. produces visible red light.

B. rarely coincides with the aiming beam.

13%

C. produces a cone of light.

46%

D. is used in capsulectomy by focusing in the anterior vitreous and moving forward.

18%

E. is more likely to damage silicone intraocular lenses optically than acrylic ones.

394 voters3.7K viewsDr Atef Ahmad, 14:21

Open / Comment

2021-12-24 17:21:56

Identify the incorrect response:

.... The source Ophthalmology Review Second Edition Editor-in-chief Myron Yanoff book

Anonymous Quiz

13%

A. the Nd:YAG laser is a photodisruptor.

25%

B. high-energy requirements of the Nd:YAG demand a pulsed- energy system.

21%

C. Q-switching is an expensive but valuable way of pulsing a laser.

22%

D. mode locking produces the shortest and most powerful pulses.

18%

E. most clinical photodisruptors are Q-switched.

256 voters3.1K viewsDr Atef Ahmad, 14:21

Open / Comment

2021-12-24 17:12:37

Identify the incorrect response:

... The source Ophthalmology Review Second Edition Editor-in-chief Myron Yanoff book

Anonymous Quiz

22%

A. the retina thins in the periphery, so less power is necessary in that area.

23%

B. peripheral retina treatment is often painful for the patient.

25%

C. a noncircular aiming beam has lower power density than a circular type.

20%

D. the laser beam is rarely parfocal with the slit-lamp’s viewing optics.

11%

E. brief exposure times are mandatory with posterior pole treatment.

224 voters2.9K viewsDr Atef Ahmad, 14:12

Open / Comment

2021-12-24 17:07:52

Identify the incorrect response:

The source Ophthalmology Review Second Edition Editor-in-chief Myron Yanoff book

Anonymous Quiz

19%

A. as a rule, contact lenses that invert the fundus view roughly dou- ble the spot size.

16%

B. whenever, laser spot size is changed, power must be adjusted.

32%

C. contact lenses giving direct fundus view(e.g.Goldmann three- mirror lens)do not change spot size.

17%

D. small spots rarely are necessary outside the posterior pole.

16%

E. small spots with high power are necessary for treating lesions in the posterior pole.

198 voters2.8K viewsDr Atef Ahmad, 14:07

Open / Comment

2021-12-24 17:04:10

Identify the incorrect response:

... The source Ophthalmology Review Second Edition Editor-in-chief Myron Yanoff book

Anonymous Quiz

14%

A. in retinal photocoagulation, laser light is absorbed by the pigment in RPE and choroid

26%

B. in most photocoagulation, the energy is uniformly distributed in the light beam.

23%

C. a tenfold increase in exposure time roughly doubles laser lesion diameter.

14%

D. brief exposure times produce a small area of extensive damage.

23%

E. doubling power doubles lesion size.

159 voters1.6K viewsDr Atef Ahmad, 14:04

Open / Comment

2021-12-24 16:57:50

Identify the incorrect response:

.. The source Ophthalmology Review Second Edition Editor-in-chief Myron Yanoff book

Anonymous Quiz

18%

A.the number of available laser wavelengths canbe increased by harmonic generation&use organic dyes

22%

B. the argon ion produces wavelengths of blue-green and green wavelengths.

30%

C. xanthophyll pigment transmits light best at 577 nm, an easy wavelength to generate with dyes.

13%

D. lasers may use gases, liquids, or solids as exciting materials.

18%

E. krypton red lasers operating at 647 nm are commonly available.

204 voters3.1K viewsDr Atef Ahmad, 13:57

Open / Comment

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The latest Messages 6

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