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. The axial length of an average adult eye is...
focus can he moved off-axis to obtain a clear reading
refractive surgery
23 to 24 mm
corneal endothelial drop-out

2. In which of the following would glare testing be most appropriate?
A-constant
that the sound beam is directed to the optic disc and the measurement is incorrect
posterior subcapsular cataract
varies according to the type of test

3. This is not evaluated using rose Bengal except...
refractive surgery
corneal endothelial drop-out
varies according to the type of test
a malingerer may invent a number - thus identifying him- or herself

4. Measuring time for the Schirmer's test is...
are based on the same general equation
that the sound beam is directed to the optic disc and the measurement is incorrect
remove the instrument from use
5 minutes

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

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6. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
5 minutes
focus can he moved off-axis to obtain a clear reading
is acceptable
shine the light flatly from the side - in the plane of the iris

7. Acquired color vision defects...
20
with the central cornea
patients who have had corneal refractive surgery
can often be cured if the causative factor is eliminated

8. The axial length of the eye is important in the calculation of...
for screening purposes - such as job applications
rods
IOL power
one-fourth

9. When should a child have his or her color vision checked?
both eyes equally
0.3 mm
before starting school
5 minutes

10. When performing a brightness acuity glare test - it is best to do which of the following?
20
10 seconds
Allow the patient to adjust to the light level before reading the letters.
red-green

11. If a biometry instrument fails to calibrate properly - one should...
focus can he moved off-axis to obtain a clear reading
refractive error
shortened axial length due to compression
remove the instrument from use

12. The Schirmer's test might be indicated in all of the following except...
0.3 mm
are based on the same general equation
dacryocystitis
the patient is shown a sample that is discernable to normal and abnormal alike

13. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
corneal endothelial drop-out
reading disabilities
ultrasound
3.0 D

14. 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?
one-fourth
Allow the patient to adjust to the light level before reading the letters.
20
with the central cornea

15. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
normal tearing
narrow beam
with the central cornea
545 pm

16. Hereditary color vision defects usually affect...
both eyes equally
decrease in vision due to glare conditions
reflex tears
are based on the same general equation

17. The difference between Schirmer's test I and II is...
the use of an anesthetic
545 pm
suspected acquired color defect
patient wearing spectacles

18. The type of pachymetry used to evaluate a glaucoma suspect is...
infrared
central corneal thickness
normal tearing
5 minutes

19. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
severe dry eye
dacryocystitis
the defect tends to remain stable over time
with the central cornea

20. When calculating IOL power - each of the following are necessary except...
holding the probe perpendicular to the corneal surface
a malingerer may invent a number - thus identifying him- or herself
white to white corneal diameter
545 pm

21. Before proceeding with the actual color plate test...
the patient is shown a sample that is discernable to normal and abnormal alike
one-fourth
narrow beam
narrow angles may precipitate an angle-closure glaucoma attack

22. Hereditary color vision defects affect...
more males than females
A-constant
for screening purposes - such as job applications
narrow angles may precipitate an angle-closure glaucoma attack

23. With the 1OLMaster - the ideal signal-to-noise ratio is...
10 seconds
the use of an anesthetic
2.0 or more
rods

24. The Ishihara color plates are useful...
10 seconds
for screening purposes - such as job applications
23 to 24 mm
one-fourth

25. In evaluating an axial length scan - the retinal echo must be...
before starting school
to the left of the scleral and orbital echoes
reflex tears
refractive surgery

26. Glare testing is used to identify...
patient wearing spectacles
20
decrease in vision due to glare conditions
ultrasound

27. Which of the following should be color-vision tested one eye at a time?
focus can he moved off-axis to obtain a clear reading
holding the probe perpendicular to the corneal surface
suspected acquired color defect
refractive error

28. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
holding the probe perpendicular to the corneal surface
2 to 3 seconds
shine the light flatly from the side - in the plane of the iris
infrared

29. In test a patient with the color pseudoisochromatic plates...
3.0 D
patient wearing spectacles
the patient should be tested with near correction - if worn
differentiate between congenital or acquired color blindness

30. _______ are not used in evaluating tear break-up time (TBUT)
tear filter papers
dacryocystitis
reading disabilities
to the left of the scleral and orbital echoes

31. Hereditary color defects most often fall into which category?
the use of an anesthetic
narrow beam
central corneal thickness
red-green

32. A patient with which of the following potential diagnoses would be tested with bengal?
severe dry eye
5 minutes
a malingerer may invent a number - thus identifying him- or herself
are based on the same general equation

33. 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?
both eyes equally
2.0 or more
0.3 mm
holding the probe perpendicular to the corneal surface

34. Which eye structure is responsible for color vision?
differentiate between congenital or acquired color blindness
20
rods
A-constant

35. The IOLMaster eliminates which of the following sources of error?
Allow the patient to adjust to the light level before reading the letters.
refractive surgery
ultrasound
shortened axial length due to compression

36. 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
A Schirmer's test of 10 mm or more is considered normal.
before starting school
dacryocystitis

37. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
before starting school
patient wearing spectacles
differentiate between congenital or acquired color blindness
blink

38. The IOLMaster evaluates each of the following except...
20
normal tearing
blink
refractive error

39. The average central thickness of the human cornea is...
20
545 pm
shortened axial length due to compression
expensive equipment

40. Pachymetry readings are routinely taken prior to...
545 pm
2 to 3 seconds
20
refractive surgery

41. Measuring corneal thickness via nonoptical pachymetry involves the use of...
ultrasound
Allow the patient to adjust to the light level before reading the letters.
10 seconds
more males than females

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

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43. Schirmer's test II is used to measure...
to have little or no shadow
to the left of the scleral and orbital echoes
0.3 mm
normal tearing

44. The ideal IOLMaster axial length graph is...
'test eye'
a tall - central spike with only one peak and smaller spikes on either site
shortened axial length due to compression
more males than females

45. A TBUT of which of the following would indicate tear film dysfunction?
a tall - central spike with only one peak and smaller spikes on either site
10 seconds
patient wearing spectacles
red - green - and blue

46. When positioning the IOLMaster for the axial length reading...
dacryocystitis
with the central cornea
focus can he moved off-axis to obtain a clear reading
severe dry eye

47. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
20
desired postoperative refraction
3.0 D
A-constant

48. When using color plates - a score indicates abnormal color vision...
ultrasound
varies according to the type of test
reading disabilities
can often be cured if the causative factor is eliminated

49. When performing the TBUT test - the observer is looking for...
10 seconds
blink
reading disabilities
the appearance of dry spots

50. Almost all of the formulas for calculating IOL power...
severe dry eye
that the sound beam is directed to the optic disc and the measurement is incorrect
infrared
are based on the same general equation