Test your basic knowledge |

Certified Ophthalmic Assistant

Subjects : certifications, health-sciences

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. When using a penlight to estimate anterior chamber depth - an open angle would appear...
2.0 or more
the patient is shown a sample that is discernable to normal and abnormal alike
to have little or no shadow
3.0 D

2. In which of the following would glare testing be most appropriate?
3.0 D
23 to 24 mm
10 seconds
posterior subcapsular cataract

3. Rose bengal is...
a staining agent
patient wearing spectacles
decrease in vision due to glare conditions
before starting school

4. A rose bengal does not require the use of...
the cobalt blue filter
23 to 24 mm
20
central corneal thickness

5. The Ishihara color plates are useful...
5 minutes
545 pm
for screening purposes - such as job applications
refractive surgery

6. _______ are not used in evaluating tear break-up time (TBUT)
a narrow angle and bowed iris cast a shadow on the iris
tear filter papers
severe dry eye
pressing on the globe too hard with the probe

7. It is important to estimate the anterior chamber depth prior to dilation because...
narrow angles may precipitate an angle-closure glaucoma attack
3.0 D
'test eye'
remove the instrument from use

8. Laser interferometry uses which type of laser light?
infrared
narrow beam
narrow angles may precipitate an angle-closure glaucoma attack
decrease in vision due to glare conditions

9. When using color plates - a score indicates abnormal color vision...
pressing on the globe too hard with the probe
posterior subcapsular cataract
shine the light flatly from the side - in the plane of the iris
varies according to the type of test

10. Estimating the anterior chamber depth with a penlight works because...
a narrow angle and bowed iris cast a shadow on the iris
to the left of the scleral and orbital echoes
2 to 3 seconds
central corneal thickness

11. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
3.0 D
differentiate between congenital or acquired color blindness
more males than females
patients who have had corneal refractive surgery

12. The IOLMaster eliminates which of the following sources of error?
5 minutes
shortened axial length due to compression
varies according to the type of test
545 pm

13. How long should the patient be given to recognize the figure in a color plate?
Allow the patient to adjust to the light level before reading the letters.
a narrow angle and bowed iris cast a shadow on the iris
2 to 3 seconds
to the left of the scleral and orbital echoes

14. Hereditary color vision defects usually affect...
reading disabilities
2 to 3 seconds
patient wearing spectacles
both eyes equally

15. Almost all of the formulas for calculating IOL power...
patient wearing spectacles
varies according to the type of test
are based on the same general equation
with the central cornea

16. A TBUT of which of the following would indicate tear film dysfunction?
before starting school
patient wearing spectacles
10 seconds
A-constant

17. Color vision defects in children are frequently detected among those with...
the appearance of dry spots
reading disabilities
refractive error
10 seconds

18. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
both eyes equally
Allow the patient to adjust to the light level before reading the letters.
the patient should be tested with near correction - if worn
shine the light flatly from the side - in the plane of the iris

19. Illumination for the color plates test...
more males than females
infrared
to have little or no shadow
varies according to the type of test administered

20. In an axial length A-scan - if there is only one tall echo from the back of the eye with no other echoes behind it - this indicates...
dacryocystitis
20
normal tearing
that the sound beam is directed to the optic disc and the measurement is incorrect

21. Before proceeding with the actual color plate test...
5 minutes
the patient is shown a sample that is discernable to normal and abnormal alike
suspected acquired color defect
patient wearing spectacles

22. The axial length of the eye is important in the calculation of...
having them trace the number/figure
severe dry eye
infrared
IOL power

23. When calculating intraocular lens (IOL) powers - one must enter...
are based on the same general equation
before starting school
the cobalt blue filter
desired postoperative refraction

24. The average central thickness of the human cornea is...
narrow angles may precipitate an angle-closure glaucoma attack
545 pm
refractive error
Allow the patient to adjust to the light level before reading the letters.

25. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
white to white corneal diameter
can often be cured if the causative factor is eliminated
shortened axial length due to compression
narrow beam

26. With the 1OLMaster - the ideal signal-to-noise ratio is...
2.0 or more
to have little or no shadow
both eyes equally
3.0 D

27. A patient with which of the following potential diagnoses would be tested with bengal?
severe dry eye
shortened axial length due to compression
refractive surgery
the use of an anesthetic

28. Young children can be tested using the color plates by...
both eyes equally
shortened axial length due to compression
having them trace the number/figure
narrow angles may precipitate an angle-closure glaucoma attack

29. Measuring time for the Schirmer's test is...
holding the probe perpendicular to the corneal surface
IOL power
posterior subcapsular cataract
5 minutes

30. When performing the TBUT test - the observer is looking for...
2 to 3 seconds
the cobalt blue filter
the appearance of dry spots
is acceptable

31. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
A-constant
20
focus can he moved off-axis to obtain a clear reading
a malingerer may invent a number - thus identifying him- or herself

32. When performing pachymetry prior to refractive surgery - it is generally best to begin...
with the central cornea
A-constant
to have little or no shadow
23 to 24 mm

33. The photosensitive pigments of the eye are sensitive to...
red - green - and blue
10 seconds
pressing on the globe too hard with the probe
posterior subcapsular cataract

34. An A-Sean can he artificially shortened due to...
pressing on the globe too hard with the probe
reading disabilities
ultrasound
one-fourth

35. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
are based on the same general equation
reading disabilities
3.0 D
expensive equipment

36. Schirmer's test does not require _____ except Test strips
shortened axial length due to compression
expensive equipment
a staining agent
the cobalt blue filter

37. A normally functioning lacrimal gland will produce by much wetting on a Schirmer's test strip after 5 minutes?

38. The type of pachymetry used to evaluate a glaucoma suspect is...
dacryocystitis
refractive surgery
central corneal thickness
refractive error

39. The difference between Schirmer's test I and II is...
infrared
refractive error
with the central cornea
the use of an anesthetic

40. When should a child have his or her color vision checked?
both eyes equally
a narrow angle and bowed iris cast a shadow on the iris
before starting school
refractive surgery

41. When performing a brightness acuity glare test - it is best to do which of the following?
more males than females
Allow the patient to adjust to the light level before reading the letters.
10 seconds
normal tearing

42. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
reading disabilities
23 to 24 mm
patient wearing spectacles
pressing on the globe too hard with the probe

43. The axial length of an average adult eye is...
23 to 24 mm
5 minutes
white to white corneal diameter
differentiate between congenital or acquired color blindness

44. A color plate that shows no obvious number to normal and abnormal alike is useful because...
IOL power
both eyes equally
a malingerer may invent a number - thus identifying him- or herself
a narrow angle and bowed iris cast a shadow on the iris

45. In evaluating an axial length scan - the retinal echo must be...
are based on the same general equation
to the left of the scleral and orbital echoes
a narrow angle and bowed iris cast a shadow on the iris
dacryocystitis

46. The ideal IOLMaster axial length graph is...
the appearance of dry spots
desired postoperative refraction
a tall - central spike with only one peak and smaller spikes on either site
20

47. In test a patient with the color pseudoisochromatic plates...
5 minutes
refractive surgery
23 to 24 mm
the patient should be tested with near correction - if worn

48. When positioning the IOLMaster for the axial length reading...
narrow angles may precipitate an angle-closure glaucoma attack
patients who have had corneal refractive surgery
focus can he moved off-axis to obtain a clear reading
more males than females

49. If a biometry instrument fails to calibrate properly - one should...
corneal endothelial drop-out
remove the instrument from use
reading disabilities
ultrasound

50. One of the keys in accurate pachymetry is...
holding the probe perpendicular to the corneal surface
decrease in vision due to glare conditions
10 seconds
a narrow angle and bowed iris cast a shadow on the iris