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. Laser interferometry uses which type of laser light?
shortened axial length due to compression
5 minutes
infrared
a narrow angle and bowed iris cast a shadow on the iris

2. In test a patient with the color pseudoisochromatic plates...
the patient should be tested with near correction - if worn
the appearance of dry spots
can often be cured if the causative factor is eliminated
a staining agent

3. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
0.3 mm
severe dry eye
narrow beam
patients who have had corneal refractive surgery

4. Glare testing is used to identify...
the use of an anesthetic
decrease in vision due to glare conditions
central corneal thickness
dacryocystitis

5. Young children can be tested using the color plates by...
narrow beam
having them trace the number/figure
that the sound beam is directed to the optic disc and the measurement is incorrect
blink

6. The average central thickness of the human cornea is...
the use of an anesthetic
rods
more males than females
545 pm

7. In which of the following would glare testing be most appropriate?
a tall - central spike with only one peak and smaller spikes on either site
posterior subcapsular cataract
the patient is shown a sample that is discernable to normal and abnormal alike
the cobalt blue filter

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

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9. The IOLMaster eliminates which of the following sources of error?
remove the instrument from use
23 to 24 mm
blink
shortened axial length due to compression

10. When using color plates - a score indicates abnormal color vision...
dacryocystitis
A-constant
suspected acquired color defect
varies according to the type of test

11. Color vision defects in children are frequently detected among those with...
refractive error
differentiate between congenital or acquired color blindness
tear filter papers
reading disabilities

12. Measuring time for the Schirmer's test is...
normal tearing
reflex tears
shine the light flatly from the side - in the plane of the iris
5 minutes

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

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14. In evaluating an axial length scan - the retinal echo must be...
normal tearing
to the left of the scleral and orbital echoes
rods
red - green - and blue

15. The IOLMaster evaluates each of the following except...
545 pm
are based on the same general equation
refractive error
a staining agent

16. If a biometry instrument fails to calibrate properly - one should...
remove the instrument from use
a tall - central spike with only one peak and smaller spikes on either site
blink
varies according to the type of test

17. When performing the TBUT test - the observer is looking for...
'test eye'
a narrow angle and bowed iris cast a shadow on the iris
23 to 24 mm
the appearance of dry spots

18. When performing a brightness acuity glare test - it is best to do which of the following?
the patient is shown a sample that is discernable to normal and abnormal alike
decrease in vision due to glare conditions
Allow the patient to adjust to the light level before reading the letters.
a tall - central spike with only one peak and smaller spikes on either site

19. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
shine the light flatly from the side - in the plane of the iris
with the central cornea
refractive error
one-fourth

20. When positioning the IOLMaster for the axial length reading...
focus can he moved off-axis to obtain a clear reading
narrow beam
ultrasound
545 pm

21. Schirmer's test II is used to measure...
to have little or no shadow
reflex tears
normal tearing
A Schirmer's test of 10 mm or more is considered normal.

22. One of the keys in accurate pachymetry is...
the patient should be tested with near correction - if worn
holding the probe perpendicular to the corneal surface
A Schirmer's test of 10 mm or more is considered normal.
10 seconds

23. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
holding the probe perpendicular to the corneal surface
patient wearing spectacles
a malingerer may invent a number - thus identifying him- or herself
normal tearing

24. Just prior to the beginning of the TBUT test - the patient is instructed to...
blink
23 to 24 mm
red-green
a narrow angle and bowed iris cast a shadow on the iris

25. How long should the patient be given to recognize the figure in a color plate?
pressing on the globe too hard with the probe
severe dry eye
patients who have had corneal refractive surgery
2 to 3 seconds

26. When should a child have his or her color vision checked?
with the central cornea
red - green - and blue
before starting school
2.0 or more

27. The photosensitive pigments of the eye are sensitive to...
3.0 D
red - green - and blue
ultrasound
before starting school

28. The axial length of an average adult eye is...
varies according to the type of test administered
23 to 24 mm
rods
reflex tears

29. Which of the following should be color-vision tested one eye at a time?
the patient should be tested with near correction - if worn
suspected acquired color defect
central corneal thickness
blink

30. Hereditary color defects most often fall into which category?
'test eye'
red-green
2 to 3 seconds
is acceptable

31. Acquired color vision defects...
a staining agent
10 seconds
can often be cured if the causative factor is eliminated
Allow the patient to adjust to the light level before reading the letters.

32. Rose bengal is...
a staining agent
desired postoperative refraction
a malingerer may invent a number - thus identifying him- or herself
shortened axial length due to compression

33. When calculating IOL power - each of the following are necessary except...
varies according to the type of test administered
white to white corneal diameter
a malingerer may invent a number - thus identifying him- or herself
having them trace the number/figure

34. Schirmer's test I is used to measure...
more males than females
2.0 or more
to the left of the scleral and orbital echoes
reflex tears

35. When comparing the axial lengths of a patient's left and right eye - how much of a difference between the eyes should signal you to repeat the measurement of both eyes?
0.3 mm
varies according to the type of test
to have little or no shadow
decrease in vision due to glare conditions

36. The Ishihara color plates are useful...
20
for screening purposes - such as job applications
the defect tends to remain stable over time
corneal endothelial drop-out

37. Hereditary color vision defects usually affect...
more males than females
both eyes equally
central corneal thickness
red - green - and blue

38. Color vision testing is used to detect all of the following except...
a tall - central spike with only one peak and smaller spikes on either site
desired postoperative refraction
white to white corneal diameter
differentiate between congenital or acquired color blindness

39. _______ are not used in evaluating tear break-up time (TBUT)
more males than females
tear filter papers
before starting school
patients who have had corneal refractive surgery

40. Pachymetry readings are routinely taken prior to...
shine the light flatly from the side - in the plane of the iris
refractive surgery
2.0 or more
remove the instrument from use

41. Estimating the anterior chamber depth with a penlight works because...
shortened axial length due to compression
rods
a narrow angle and bowed iris cast a shadow on the iris
23 to 24 mm

42. 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)...
A-constant
5 minutes
reflex tears
blink

43. With the 1OLMaster - the ideal signal-to-noise ratio is...
the use of an anesthetic
2.0 or more
10 seconds
to the left of the scleral and orbital echoes

44. Illumination for the color plates test...
10 seconds
shine the light flatly from the side - in the plane of the iris
to the left of the scleral and orbital echoes
varies according to the type of test administered

45. A color plate that shows no obvious number to normal and abnormal alike is useful because...
IOL power
a malingerer may invent a number - thus identifying him- or herself
dacryocystitis
refractive surgery

46. Almost all of the formulas for calculating IOL power...
refractive surgery
to the left of the scleral and orbital echoes
with the central cornea
are based on the same general equation

47. The Schirmer's test might be indicated in all of the following except...
dacryocystitis
normal tearing
ultrasound
more males than females

48. When using a penlight to estimate anterior chamber depth - an open angle would appear...
to have little or no shadow
a malingerer may invent a number - thus identifying him- or herself
0.3 mm
patients who have had corneal refractive surgery

49. 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...
more males than females
that the sound beam is directed to the optic disc and the measurement is incorrect
remove the instrument from use
focus can he moved off-axis to obtain a clear reading

50. Measuring corneal thickness via nonoptical pachymetry involves the use of...
ultrasound
to the left of the scleral and orbital echoes
corneal endothelial drop-out
2.0 or more