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. 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
patients who have had corneal refractive surgery
a staining agent
pressing on the globe too hard with the probe

2. Just prior to the beginning of the TBUT test - the patient is instructed to...
the patient should be tested with near correction - if worn
white to white corneal diameter
a narrow angle and bowed iris cast a shadow on the iris
blink

3. 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...
varies according to the type of test administered
red - green - and blue
corneal endothelial drop-out
that the sound beam is directed to the optic disc and the measurement is incorrect

4. An A-Sean can he artificially shortened due to...
rods
A Schirmer's test of 10 mm or more is considered normal.
pressing on the globe too hard with the probe
shortened axial length due to compression

5. Laser interferometry uses which type of laser light?
the cobalt blue filter
reflex tears
dacryocystitis
infrared

6. 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?
the defect tends to remain stable over time
varies according to the type of test administered
rods
0.3 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)...
the cobalt blue filter
that the sound beam is directed to the optic disc and the measurement is incorrect
one-fourth
A-constant

8. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
desired postoperative refraction
narrow angles may precipitate an angle-closure glaucoma attack
patients who have had corneal refractive surgery
posterior subcapsular cataract

9. Almost all of the formulas for calculating IOL power...
are based on the same general equation
blink
shine the light flatly from the side - in the plane of the iris
the cobalt blue filter

10. When calculating intraocular lens (IOL) powers - one must enter...
to the left of the scleral and orbital echoes
refractive surgery
desired postoperative refraction
narrow angles may precipitate an angle-closure glaucoma attack

11. The IOLMaster eliminates which of the following sources of error?
with the central cornea
the appearance of dry spots
shortened axial length due to compression
20

12. When performing pachymetry prior to refractive surgery - it is generally best to begin...
focus can he moved off-axis to obtain a clear reading
refractive error
with the central cornea
0.3 mm

13. In which of the following would glare testing be most appropriate?
posterior subcapsular cataract
for screening purposes - such as job applications
suspected acquired color defect
expensive equipment

14. Measuring time for the Schirmer's test is...
the appearance of dry spots
for screening purposes - such as job applications
5 minutes
the defect tends to remain stable over time

15. A TBUT of which of the following would indicate tear film dysfunction?
suspected acquired color defect
the appearance of dry spots
Allow the patient to adjust to the light level before reading the letters.
10 seconds

16. Hereditary color vision defects usually affect...
both eyes equally
severe dry eye
corneal endothelial drop-out
blink

17. When using a penlight to estimate anterior chamber depth - an open angle would appear...
the use of an anesthetic
to have little or no shadow
red-green
before starting school

18. Schirmer's test I is used to measure...
varies according to the type of test
remove the instrument from use
reflex tears
can often be cured if the causative factor is eliminated

19. Illumination for the color plates test...
posterior subcapsular cataract
varies according to the type of test administered
the appearance of dry spots
shortened axial length due to compression

20. When calculating IOL power - each of the following are necessary except...
white to white corneal diameter
red - green - and blue
the use of an anesthetic
the appearance of dry spots

21. In evaluating an axial length scan - the retinal echo must be...
to the left of the scleral and orbital echoes
IOL power
'test eye'
a narrow angle and bowed iris cast a shadow on the iris

22. It is important to estimate the anterior chamber depth prior to dilation because...
can often be cured if the causative factor is eliminated
Allow the patient to adjust to the light level before reading the letters.
to have little or no shadow
narrow angles may precipitate an angle-closure glaucoma attack

23. Rose bengal is...
20
remove the instrument from use
with the central cornea
a staining agent

24. When using color plates - a score indicates abnormal color vision...
the patient should be tested with near correction - if worn
varies according to the type of test
shortened axial length due to compression
5 minutes

25. The Ishihara color plates are useful...
A Schirmer's test of 10 mm or more is considered normal.
for screening purposes - such as job applications
before starting school
having them trace the number/figure

26. The average central thickness of the human cornea is...
2 to 3 seconds
the patient should be tested with near correction - if worn
545 pm
focus can he moved off-axis to obtain a clear reading

27. Schirmer's test II is used to measure...
varies according to the type of test administered
posterior subcapsular cataract
23 to 24 mm
normal tearing

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

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29. Acquired color vision defects...
normal tearing
reading disabilities
central corneal thickness
can often be cured if the causative factor is eliminated

30. The type of pachymetry used to evaluate a glaucoma suspect is...
545 pm
red - green - and blue
central corneal thickness
one-fourth

31. The axial length of the eye is important in the calculation of...
refractive surgery
A Schirmer's test of 10 mm or more is considered normal.
with the central cornea
IOL power

32. 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
the use of an anesthetic
corneal endothelial drop-out
20

33. One of the keys in accurate pachymetry is...
3.0 D
for screening purposes - such as job applications
holding the probe perpendicular to the corneal surface
varies according to the type of test

34. Before proceeding with the actual color plate test...
the patient is shown a sample that is discernable to normal and abnormal alike
23 to 24 mm
more males than females
'test eye'

35. A color plate that shows no obvious number to normal and abnormal alike is useful because...
shortened axial length due to compression
a malingerer may invent a number - thus identifying him- or herself
patient wearing spectacles
2 to 3 seconds

36. _______ are not used in evaluating tear break-up time (TBUT)
desired postoperative refraction
remove the instrument from use
tear filter papers
narrow angles may precipitate an angle-closure glaucoma attack

37. This is not evaluated using rose Bengal except...
a malingerer may invent a number - thus identifying him- or herself
corneal endothelial drop-out
20
expensive equipment

38. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
3.0 D
the defect tends to remain stable over time
posterior subcapsular cataract
focus can he moved off-axis to obtain a clear reading

39. Pachymetry readings are routinely taken prior to...
holding the probe perpendicular to the corneal surface
to the left of the scleral and orbital echoes
3.0 D
refractive surgery

40. When positioning the IOLMaster for the axial length reading...
A-constant
are based on the same general equation
focus can he moved off-axis to obtain a clear reading
that the sound beam is directed to the optic disc and the measurement is incorrect

41. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
the defect tends to remain stable over time
0.3 mm
patient wearing spectacles
is acceptable

42. In slit-lamp assessment of the corneal periphery - the dark interval should be a minimum of approximately how much of the total corneal width for the angle to he considered open and safe for dilation?
10 seconds
can often be cured if the causative factor is eliminated
the use of an anesthetic
one-fourth

43. Hereditary color defects most often fall into which category?
red-green
are based on the same general equation
0.3 mm
rods

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

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45. The ideal IOLMaster axial length graph is...
infrared
the defect tends to remain stable over time
a tall - central spike with only one peak and smaller spikes on either site
A-constant

46. Estimating the anterior chamber depth with a penlight works because...
IOL power
the use of an anesthetic
a narrow angle and bowed iris cast a shadow on the iris
the appearance of dry spots

47. Which of the following should be color-vision tested one eye at a time?
545 pm
a staining agent
the appearance of dry spots
suspected acquired color defect

48. A rose bengal does not require the use of...
the cobalt blue filter
the use of an anesthetic
10 seconds
desired postoperative refraction

49. Glare testing is used to identify...
differentiate between congenital or acquired color blindness
narrow angles may precipitate an angle-closure glaucoma attack
normal tearing
decrease in vision due to glare conditions

50. Which eye structure is responsible for color vision?
rods
with the central cornea
refractive error
are based on the same general equation