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. Measuring time for the Schirmer's test is...
that the sound beam is directed to the optic disc and the measurement is incorrect
expensive equipment
blink
5 minutes

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

3. Acquired color vision defects...
that the sound beam is directed to the optic disc and the measurement is incorrect
with the central cornea
infrared
can often be cured if the causative factor is eliminated

4. Just prior to the beginning of the TBUT test - the patient is instructed to...
having them trace the number/figure
3.0 D
blink
focus can he moved off-axis to obtain a clear reading

5. An A-Sean can he artificially shortened due to...
are based on the same general equation
pressing on the globe too hard with the probe
23 to 24 mm
patient wearing spectacles

6. The Schirmer's test might be indicated in all of the following except...
tear filter papers
dacryocystitis
with the central cornea
23 to 24 mm

7. 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)...
with the central cornea
severe dry eye
narrow beam
A-constant

8. Which eye structure is responsible for color vision?
both eyes equally
rods
remove the instrument from use
decrease in vision due to glare conditions

9. Pachymetry readings are routinely taken prior to...
more males than females
holding the probe perpendicular to the corneal surface
refractive surgery
varies according to the type of test

10. Before proceeding with the actual color plate test...
the patient is shown a sample that is discernable to normal and abnormal alike
10 seconds
both eyes equally
patients who have had corneal refractive surgery

11. 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
blink
infrared
tear filter papers

12. Hereditary color vision defects usually affect...
red - green - and blue
both eyes equally
a staining agent
narrow beam

13. When positioning the IOLMaster for the axial length reading...
focus can he moved off-axis to obtain a clear reading
can often be cured if the causative factor is eliminated
severe dry eye
10 seconds

14. How long should the patient be given to recognize the figure in a color plate?
tear filter papers
2 to 3 seconds
desired postoperative refraction
shine the light flatly from the side - in the plane of the iris

15. Hereditary color defects most often fall into which category?
5 minutes
'test eye'
red-green
can often be cured if the causative factor is eliminated

16. _______ are not used in evaluating tear break-up time (TBUT)
patients who have had corneal refractive surgery
0.3 mm
3.0 D
tear filter papers

17. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
posterior subcapsular cataract
the defect tends to remain stable over time
20
varies according to the type of test administered

18. In evaluating an axial length scan - the retinal echo must be...
the cobalt blue filter
to the left of the scleral and orbital echoes
2.0 or more
23 to 24 mm

19. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
a tall - central spike with only one peak and smaller spikes on either site
can often be cured if the causative factor is eliminated
patient wearing spectacles
severe dry eye

20. 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
dacryocystitis
the appearance of dry spots
the use of an anesthetic

21. A patient with which of the following potential diagnoses would be tested with bengal?
IOL power
reflex tears
suspected acquired color defect
severe dry eye

22. Illumination for the color plates test...
varies according to the type of test administered
for screening purposes - such as job applications
0.3 mm
IOL power

23. Hereditary color vision defects affect...
for screening purposes - such as job applications
a narrow angle and bowed iris cast a shadow on the iris
more males than females
2 to 3 seconds

24. The axial length of the eye is important in the calculation of...
IOL power
for screening purposes - such as job applications
severe dry eye
before starting school

25. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
20
10 seconds
narrow angles may precipitate an angle-closure glaucoma attack
545 pm

26. The IOLMaster eliminates which of the following sources of error?
expensive equipment
the patient is shown a sample that is discernable to normal and abnormal alike
shortened axial length due to compression
suspected acquired color defect

27. Schirmer's test II is used to measure...
A Schirmer's test of 10 mm or more is considered normal.
reflex tears
normal tearing
patient wearing spectacles

28. When using a penlight to estimate anterior chamber depth - an open angle would appear...
narrow beam
to have little or no shadow
Allow the patient to adjust to the light level before reading the letters.
varies according to the type of test

29. With the 1OLMaster - the ideal signal-to-noise ratio is...
the defect tends to remain stable over time
2.0 or more
varies according to the type of test administered
before starting school

30. When calculating intraocular lens (IOL) powers - one must enter...
5 minutes
IOL power
desired postoperative refraction
to have little or no shadow

31. The average central thickness of the human cornea is...
expensive equipment
central corneal thickness
545 pm
differentiate between congenital or acquired color blindness

32. When calculating IOL power - each of the following are necessary except...
narrow beam
the patient should be tested with near correction - if worn
white to white corneal diameter
A-constant

33. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
pressing on the globe too hard with the probe
3.0 D
patient wearing spectacles
for screening purposes - such as job applications

34. Color vision testing is used to detect all of the following except...
differentiate between congenital or acquired color blindness
for screening purposes - such as job applications
can often be cured if the causative factor is eliminated
decrease in vision due to glare conditions

35. The IOLMaster evaluates each of the following except...
a tall - central spike with only one peak and smaller spikes on either site
A-constant
2.0 or more
refractive error

36. The photosensitive pigments of the eye are sensitive to...
red - green - and blue
posterior subcapsular cataract
Allow the patient to adjust to the light level before reading the letters.
ultrasound

37. One of the keys in accurate pachymetry is...
refractive error
holding the probe perpendicular to the corneal surface
a malingerer may invent a number - thus identifying him- or herself
narrow angles may precipitate an angle-closure glaucoma attack

38. The difference between Schirmer's test I and II is...
the use of an anesthetic
red-green
focus can he moved off-axis to obtain a clear reading
the cobalt blue filter

39. Almost all of the formulas for calculating IOL power...
are based on the same general equation
the use of an anesthetic
20
shine the light flatly from the side - in the plane of the iris

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

41. Measuring corneal thickness via nonoptical pachymetry involves the use of...
white to white corneal diameter
varies according to the type of test administered
normal tearing
ultrasound

42. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
2 to 3 seconds
severe dry eye
is acceptable
that the sound beam is directed to the optic disc and the measurement is incorrect

43. Estimating the anterior chamber depth with a penlight works because...
ultrasound
the use of an anesthetic
a narrow angle and bowed iris cast a shadow on the iris
narrow beam

44. A TBUT of which of the following would indicate tear film dysfunction?
10 seconds
having them trace the number/figure
shine the light flatly from the side - in the plane of the iris
a staining agent

45. Schirmer's test I is used to measure...
decrease in vision due to glare conditions
A Schirmer's test of 10 mm or more is considered normal.
shine the light flatly from the side - in the plane of the iris
reflex tears

46. If a biometry instrument fails to calibrate properly - one should...
a malingerer may invent a number - thus identifying him- or herself
to the left of the scleral and orbital echoes
pressing on the globe too hard with the probe
remove the instrument from use

47. Young children can be tested using the color plates by...
that the sound beam is directed to the optic disc and the measurement is incorrect
refractive surgery
having them trace the number/figure
to the left of the scleral and orbital echoes

48. When performing a brightness acuity glare test - it is best to do which of the following?
expensive equipment
the cobalt blue filter
IOL power
Allow the patient to adjust to the light level before reading the letters.

49. Which of the following should be color-vision tested one eye at a time?
suspected acquired color defect
refractive error
corneal endothelial drop-out
decrease in vision due to glare conditions

50. A color plate that shows no obvious number to normal and abnormal alike is useful because...
suspected acquired color defect
a malingerer may invent a number - thus identifying him- or herself
focus can he moved off-axis to obtain a clear reading
a staining agent