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. In evaluating an axial length scan - the retinal echo must be...
3.0 D
reflex tears
shine the light flatly from the side - in the plane of the iris
to the left of the scleral and orbital echoes

2. When performing the TBUT test - the observer is looking for...
refractive surgery
the patient should be tested with near correction - if worn
the patient is shown a sample that is discernable to normal and abnormal alike
the appearance of dry spots

3. When calculating intraocular lens (IOL) powers - one must enter...
a malingerer may invent a number - thus identifying him- or herself
a staining agent
desired postoperative refraction
corneal endothelial drop-out

4. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
the appearance of dry spots
20
'test eye'
with the central cornea

5. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
the defect tends to remain stable over time
pressing on the globe too hard with the probe
shine the light flatly from the side - in the plane of the iris
shortened axial length due to compression

6. Just prior to the beginning of the TBUT test - the patient is instructed to...
one-fourth
blink
holding the probe perpendicular to the corneal surface
shine the light flatly from the side - in the plane of the iris

7. Estimating the anterior chamber depth with a penlight works because...
the defect tends to remain stable over time
refractive surgery
varies according to the type of test administered
a narrow angle and bowed iris cast a shadow on the iris

8. Which eye structure is responsible for color vision?
infrared
rods
a malingerer may invent a number - thus identifying him- or herself
central corneal thickness

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

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10. With the 1OLMaster - the ideal signal-to-noise ratio is...
2.0 or more
decrease in vision due to glare conditions
is acceptable
tear filter papers

11. Color vision testing is used to detect all of the following except...
is acceptable
red-green
reading disabilities
differentiate between congenital or acquired color blindness

12. The Schirmer's test might be indicated in all of the following except...
23 to 24 mm
pressing on the globe too hard with the probe
dacryocystitis
are based on the same general equation

13. 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...
that the sound beam is directed to the optic disc and the measurement is incorrect
corneal endothelial drop-out
central corneal thickness
focus can he moved off-axis to obtain a clear reading

14. Schirmer's test II is used to measure...
refractive error
'test eye'
normal tearing
are based on the same general equation

15. Illumination for the color plates test...
23 to 24 mm
patients who have had corneal refractive surgery
varies according to the type of test administered
varies according to the type of test

16. The Ishihara color plates are useful...
that the sound beam is directed to the optic disc and the measurement is incorrect
holding the probe perpendicular to the corneal surface
for screening purposes - such as job applications
shortened axial length due to compression

17. When performing a brightness acuity glare test - it is best to do which of the following?
Allow the patient to adjust to the light level before reading the letters.
focus can he moved off-axis to obtain a clear reading
patient wearing spectacles
central corneal thickness

18. The difference between Schirmer's test I and II is...
the use of an anesthetic
central corneal thickness
more males than females
20

19. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
patient wearing spectacles
ultrasound
normal tearing
with the central cornea

20. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
blink
3.0 D
the patient should be tested with near correction - if worn
5 minutes

21. The manufacturer of a given IOL often supplies a specific number that must be entered into the IOL calculations when the lens is to be used. This number is refer to as a(n)...
varies according to the type of test administered
A-constant
20
the cobalt blue filter

22. A patient with which of the following potential diagnoses would be tested with bengal?
severe dry eye
red-green
posterior subcapsular cataract
suspected acquired color defect

23. Hereditary color vision defects usually affect...
IOL power
the use of an anesthetic
reflex tears
both eyes equally

24. When performing pachymetry prior to refractive surgery - it is generally best to begin...
the appearance of dry spots
the defect tends to remain stable over time
varies according to the type of test administered
with the central cornea

25. This is not evaluated using rose Bengal except...
decrease in vision due to glare conditions
tear filter papers
corneal endothelial drop-out
shine the light flatly from the side - in the plane of the iris

26. Pachymetry readings are routinely taken prior to...
A Schirmer's test of 10 mm or more is considered normal.
more males than females
refractive surgery
shine the light flatly from the side - in the plane of the iris

27. The IOLMaster eliminates which of the following sources of error?
shortened axial length due to compression
the use of an anesthetic
the defect tends to remain stable over time
dacryocystitis

28. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
remove the instrument from use
both eyes equally
reading disabilities
patients who have had corneal refractive surgery

29. When using a penlight to estimate anterior chamber depth - an open angle would appear...
remove the instrument from use
desired postoperative refraction
to have little or no shadow
IOL power

30. Measuring corneal thickness via nonoptical pachymetry involves the use of...
ultrasound
2 to 3 seconds
more males than females
5 minutes

31. How long should the patient be given to recognize the figure in a color plate?
the patient should be tested with near correction - if worn
to the left of the scleral and orbital echoes
varies according to the type of test administered
2 to 3 seconds

32. It is important to estimate the anterior chamber depth prior to dilation because...
patient wearing spectacles
narrow angles may precipitate an angle-closure glaucoma attack
one-fourth
the use of an anesthetic

33. In which of the following would glare testing be most appropriate?
a staining agent
posterior subcapsular cataract
pressing on the globe too hard with the probe
white to white corneal diameter

34. Hereditary color vision defects affect...
more males than females
that the sound beam is directed to the optic disc and the measurement is incorrect
the defect tends to remain stable over time
a malingerer may invent a number - thus identifying him- or herself

35. Rose bengal is...
patients who have had corneal refractive surgery
a staining agent
for screening purposes - such as job applications
shine the light flatly from the side - in the plane of the iris

36. The IOLMaster must be calibrated daily using a...

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37. Acquired color vision defects...
the patient should be tested with near correction - if worn
can often be cured if the causative factor is eliminated
the use of an anesthetic
red - green - and blue

38. Which of the following should be color-vision tested one eye at a time?
suspected acquired color defect
a narrow angle and bowed iris cast a shadow on the iris
is acceptable
central corneal thickness

39. _______ are not used in evaluating tear break-up time (TBUT)
Allow the patient to adjust to the light level before reading the letters.
tear filter papers
more males than females
shine the light flatly from the side - in the plane of the iris

40. One of the keys in accurate pachymetry is...
normal tearing
refractive surgery
holding the probe perpendicular to the corneal surface
differentiate between congenital or acquired color blindness

41. The average central thickness of the human cornea is...
545 pm
red-green
A-constant
0.3 mm

42. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
remove the instrument from use
narrow beam
Allow the patient to adjust to the light level before reading the letters.
for screening purposes - such as job applications

43. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
is acceptable
23 to 24 mm
Allow the patient to adjust to the light level before reading the letters.
rods

44. The IOLMaster evaluates each of the following except...
are based on the same general equation
infrared
suspected acquired color defect
refractive error

45. The axial length of the eye is important in the calculation of...
corneal endothelial drop-out
IOL power
Allow the patient to adjust to the light level before reading the letters.
infrared

46. When should a child have his or her color vision checked?
10 seconds
before starting school
white to white corneal diameter
the appearance of dry spots

47. Hereditary color defects most often fall into which category?
IOL power
red-green
decrease in vision due to glare conditions
the patient should be tested with near correction - if worn

48. The ideal IOLMaster axial length graph is...
the cobalt blue filter
narrow beam
narrow angles may precipitate an angle-closure glaucoma attack
a tall - central spike with only one peak and smaller spikes on either site

49. Young children can be tested using the color plates by...
the cobalt blue filter
expensive equipment
having them trace the number/figure
10 seconds

50. The axial length of an average adult eye is...
23 to 24 mm
one-fourth
5 minutes
a staining agent