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. Schirmer's test II is used to measure...
normal tearing
focus can he moved off-axis to obtain a clear reading
severe dry eye
holding the probe perpendicular to the corneal surface

2. With the 1OLMaster - the ideal signal-to-noise ratio is...
blink
narrow beam
one-fourth
2.0 or more

3. The photosensitive pigments of the eye are sensitive to...
a staining agent
red - green - and blue
are based on the same general equation
2.0 or more

4. 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
corneal endothelial drop-out
having them trace the number/figure
the patient should be tested with near correction - if worn

5. Estimating the anterior chamber depth with a penlight works because...
tear filter papers
corneal endothelial drop-out
that the sound beam is directed to the optic disc and the measurement is incorrect
a narrow angle and bowed iris cast a shadow on the iris

6. Color vision defects in children are frequently detected among those with...
varies according to the type of test
reading disabilities
the use of an anesthetic
expensive equipment

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

8. In which of the following would glare testing be most appropriate?
posterior subcapsular cataract
2 to 3 seconds
patients who have had corneal refractive surgery
23 to 24 mm

9. When using color plates - a score indicates abnormal color vision...
shortened axial length due to compression
2.0 or more
varies according to the type of test
A-constant

10. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
more males than females
Allow the patient to adjust to the light level before reading the letters.
posterior subcapsular cataract
the defect tends to remain stable over time

11. _______ are not used in evaluating tear break-up time (TBUT)
the use of an anesthetic
tear filter papers
severe dry eye
red-green

12. Acquired color vision defects...
'test eye'
can often be cured if the causative factor is eliminated
the defect tends to remain stable over time
severe dry eye

13. Measuring time for the Schirmer's test is...
23 to 24 mm
5 minutes
20
tear filter papers

14. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
pressing on the globe too hard with the probe
for screening purposes - such as job applications
is acceptable
remove the instrument from use

15. When positioning the IOLMaster for the axial length reading...
reflex tears
focus can he moved off-axis to obtain a clear reading
narrow beam
differentiate between congenital or acquired color blindness

16. Measuring corneal thickness via nonoptical pachymetry involves the use of...
differentiate between congenital or acquired color blindness
patients who have had corneal refractive surgery
ultrasound
both eyes equally

17. Color vision testing is used to detect all of the following except...
shortened axial length due to compression
corneal endothelial drop-out
posterior subcapsular cataract
differentiate between congenital or acquired color blindness

18. A color plate that shows no obvious number to normal and abnormal alike is useful because...
to have little or no shadow
focus can he moved off-axis to obtain a clear reading
normal tearing
a malingerer may invent a number - thus identifying him- or herself

19. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
central corneal thickness
20
patient wearing spectacles
rods

20. A rose bengal does not require the use of...
the cobalt blue filter
posterior subcapsular cataract
the appearance of dry spots
to have little or no shadow

21. If a biometry instrument fails to calibrate properly - one should...
both eyes equally
reflex tears
infrared
remove the instrument from use

22. When performing the TBUT test - the observer is looking for...
refractive surgery
A Schirmer's test of 10 mm or more is considered normal.
the appearance of dry spots
desired postoperative refraction

23. Schirmer's test I is used to measure...
reflex tears
narrow angles may precipitate an angle-closure glaucoma attack
reading disabilities
for screening purposes - such as job applications

24. 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...
a staining agent
that the sound beam is directed to the optic disc and the measurement is incorrect
red-green
a tall - central spike with only one peak and smaller spikes on either site

25. Hereditary color vision defects affect...
more males than females
the appearance of dry spots
with the central cornea
the cobalt blue filter

26. When should a child have his or her color vision checked?
before starting school
focus can he moved off-axis to obtain a clear reading
desired postoperative refraction
0.3 mm

27. The ideal IOLMaster axial length graph is...
a malingerer may invent a number - thus identifying him- or herself
2.0 or more
the use of an anesthetic
a tall - central spike with only one peak and smaller spikes on either site

28. When calculating intraocular lens (IOL) powers - one must enter...
red - green - and blue
are based on the same general equation
central corneal thickness
desired postoperative refraction

29. Illumination for the color plates test...
varies according to the type of test administered
A Schirmer's test of 10 mm or more is considered normal.
rods
the defect tends to remain stable over time

30. Laser interferometry uses which type of laser light?
infrared
10 seconds
white to white corneal diameter
can often be cured if the causative factor is eliminated

31. When performing pachymetry prior to refractive surgery - it is generally best to begin...
refractive error
one-fourth
both eyes equally
with the central cornea

32. This is not evaluated using rose Bengal except...
narrow beam
central corneal thickness
shortened axial length due to compression
corneal endothelial drop-out

33. Before proceeding with the actual color plate test...
red - green - and blue
reflex tears
the patient is shown a sample that is discernable to normal and abnormal alike
3.0 D

34. 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?
is acceptable
refractive error
holding the probe perpendicular to the corneal surface
one-fourth

35. The average central thickness of the human cornea is...
infrared
more males than females
545 pm
focus can he moved off-axis to obtain a clear reading

36. A TBUT of which of the following would indicate tear film dysfunction?
10 seconds
blink
white to white corneal diameter
'test eye'

37. The IOLMaster eliminates which of the following sources of error?
can often be cured if the causative factor is eliminated
patients who have had corneal refractive surgery
for screening purposes - such as job applications
shortened axial length due to compression

38. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
tear filter papers
patient wearing spectacles
3.0 D
that the sound beam is directed to the optic disc and the measurement is incorrect

39. The IOLMaster evaluates each of the following except...
differentiate between congenital or acquired color blindness
refractive error
that the sound beam is directed to the optic disc and the measurement is incorrect
narrow beam

40. The axial length of the eye is important in the calculation of...
are based on the same general equation
IOL power
a malingerer may invent a number - thus identifying him- or herself
dacryocystitis

41. It is important to estimate the anterior chamber depth prior to dilation because...
'test eye'
posterior subcapsular cataract
with the central cornea
narrow angles may precipitate an angle-closure glaucoma attack

42. Hereditary color defects most often fall into which category?
red-green
suspected acquired color defect
a narrow angle and bowed iris cast a shadow on the iris
expensive equipment

43. When calculating IOL power - each of the following are necessary except...
a malingerer may invent a number - thus identifying him- or herself
refractive error
3.0 D
white to white corneal diameter

44. The axial length of an average adult eye is...
a staining agent
tear filter papers
23 to 24 mm
the patient is shown a sample that is discernable to normal and abnormal alike

45. Which of the following should be color-vision tested one eye at a time?
3.0 D
patients who have had corneal refractive surgery
suspected acquired color defect
A Schirmer's test of 10 mm or more is considered normal.

46. Rose bengal is...
the appearance of dry spots
a staining agent
the cobalt blue filter
A-constant

47. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
differentiate between congenital or acquired color blindness
patients who have had corneal refractive surgery
the use of an anesthetic
decrease in vision due to glare conditions

48. A patient with which of the following potential diagnoses would be tested with bengal?
23 to 24 mm
severe dry eye
central corneal thickness
focus can he moved off-axis to obtain a clear reading

49. 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?
normal tearing
focus can he moved off-axis to obtain a clear reading
10 seconds
0.3 mm

50. Which eye structure is responsible for color vision?
both eyes equally
decrease in vision due to glare conditions
rods
the patient should be tested with near correction - if worn