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 Ishihara color plates are useful...
that the sound beam is directed to the optic disc and the measurement is incorrect
rods
for screening purposes - such as job applications
IOL power

2. Just prior to the beginning of the TBUT test - the patient is instructed to...
the defect tends to remain stable over time
blink
are based on the same general equation
20

3. Rose bengal is...
the defect tends to remain stable over time
the appearance of dry spots
differentiate between congenital or acquired color blindness
a staining agent

4. When calculating intraocular lens (IOL) powers - one must enter...
desired postoperative refraction
20
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

5. Measuring time for the Schirmer's test is...
blink
patients who have had corneal refractive surgery
5 minutes
reflex tears

6. Color vision testing is used to detect all of the following except...
reading disabilities
differentiate between congenital or acquired color blindness
the defect tends to remain stable over time
545 pm

7. The axial length of an average adult eye is...
20
with the central cornea
reading disabilities
23 to 24 mm

8. Which eye structure is responsible for color vision?
one-fourth
to the left of the scleral and orbital echoes
narrow angles may precipitate an angle-closure glaucoma attack
rods

9. It is important to estimate the anterior chamber depth prior to dilation because...
to have little or no shadow
central corneal thickness
red - green - and blue
narrow angles may precipitate an angle-closure glaucoma attack

10. The average central thickness of the human cornea is...
red-green
545 pm
A Schirmer's test of 10 mm or more is considered normal.
decrease in vision due to glare conditions

11. Before proceeding with the actual color plate test...
the patient is shown a sample that is discernable to normal and abnormal alike
Allow the patient to adjust to the light level before reading the letters.
A-constant
corneal endothelial drop-out

12. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
tear filter papers
narrow beam
more males than females
a tall - central spike with only one peak and smaller spikes on either site

13. Illumination for the color plates test...
varies according to the type of test administered
20
pressing on the globe too hard with the probe
desired postoperative refraction

14. Hereditary color defects most often fall into which category?
a staining agent
more males than females
red-green
can often be cured if the causative factor is eliminated

15. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
reflex tears
the defect tends to remain stable over time
varies according to the type of test administered
the patient is shown a sample that is discernable to normal and abnormal alike

16. When should a child have his or her color vision checked?
ultrasound
narrow angles may precipitate an angle-closure glaucoma attack
rods
before starting school

17. With the 1OLMaster - the ideal signal-to-noise ratio is...
2.0 or more
rods
A-constant
white to white corneal diameter

18. 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?
IOL power
tear filter papers
for screening purposes - such as job applications
0.3 mm

19. A color plate that shows no obvious number to normal and abnormal alike is useful because...
a malingerer may invent a number - thus identifying him- or herself
one-fourth
to the left of the scleral and orbital echoes
white to white corneal diameter

20. Acquired color vision defects...
suspected acquired color defect
posterior subcapsular cataract
reflex tears
can often be cured if the causative factor is eliminated

21. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
decrease in vision due to glare conditions
patient wearing spectacles
rods
that the sound beam is directed to the optic disc and the measurement is incorrect

22. 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
the patient should be tested with near correction - if worn
545 pm
that the sound beam is directed to the optic disc and the measurement is incorrect

23. When positioning the IOLMaster for the axial length reading...
desired postoperative refraction
focus can he moved off-axis to obtain a clear reading
refractive surgery
10 seconds

24. Laser interferometry uses which type of laser light?
2 to 3 seconds
5 minutes
infrared
the defect tends to remain stable over time

25. Which of the following should be color-vision tested one eye at a time?
suspected acquired color defect
one-fourth
23 to 24 mm
severe dry eye

26. 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?
a staining agent
that the sound beam is directed to the optic disc and the measurement is incorrect
severe dry eye
one-fourth

27. Color vision defects in children are frequently detected among those with...
reading disabilities
the defect tends to remain stable over time
ultrasound
A-constant

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

29. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
shortened axial length due to compression
shine the light flatly from the side - in the plane of the iris
are based on the same general equation
the cobalt blue filter

30. The type of pachymetry used to evaluate a glaucoma suspect is...
expensive equipment
central corneal thickness
'test eye'
narrow angles may precipitate an angle-closure glaucoma attack

31. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
patients who have had corneal refractive surgery
a tall - central spike with only one peak and smaller spikes on either site
5 minutes
is acceptable

32. A patient with which of the following potential diagnoses would be tested with bengal?
dacryocystitis
severe dry eye
patient wearing spectacles
3.0 D

33. In evaluating an axial length scan - the retinal echo must be...
to the left of the scleral and orbital echoes
ultrasound
white to white corneal diameter
'test eye'

34. One of the keys in accurate pachymetry is...
varies according to the type of test administered
holding the probe perpendicular to the corneal surface
blink
are based on the same general equation

35. The IOLMaster eliminates which of the following sources of error?
the patient is shown a sample that is discernable to normal and abnormal alike
shortened axial length due to compression
are based on the same general equation
patients who have had corneal refractive surgery

36. In which of the following would glare testing be most appropriate?
20
A Schirmer's test of 10 mm or more is considered normal.
decrease in vision due to glare conditions
posterior subcapsular cataract

37. When using color plates - a score indicates abnormal color vision...
varies according to the type of test
3.0 D
the appearance of dry spots
10 seconds

38. Hereditary color vision defects affect...
differentiate between congenital or acquired color blindness
varies according to the type of test
holding the probe perpendicular to the corneal surface
more males than females

39. Glare testing is used to identify...
'test eye'
differentiate between congenital or acquired color blindness
white to white corneal diameter
decrease in vision due to glare conditions

40. The photosensitive pigments of the eye are sensitive to...
infrared
2 to 3 seconds
red-green
red - green - and blue

41. How long should the patient be given to recognize the figure in a color plate?
2 to 3 seconds
that the sound beam is directed to the optic disc and the measurement is incorrect
the defect tends to remain stable over time
suspected acquired color defect

42. The axial length of the eye is important in the calculation of...
both eyes equally
central corneal thickness
IOL power
remove the instrument from use

43. This is not evaluated using rose Bengal except...
the defect tends to remain stable over time
corneal endothelial drop-out
a malingerer may invent a number - thus identifying him- or herself
dacryocystitis

44. When using a penlight to estimate anterior chamber depth - an open angle would appear...
to have little or no shadow
10 seconds
'test eye'
ultrasound

45. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
is acceptable
the defect tends to remain stable over time
white to white corneal diameter
2 to 3 seconds

46. Pachymetry readings are routinely taken prior to...
refractive surgery
5 minutes
suspected acquired color defect
corneal endothelial drop-out

47. The Schirmer's test might be indicated in all of the following except...
the appearance of dry spots
both eyes equally
suspected acquired color defect
dacryocystitis

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

49. A rose bengal does not require the use of...
'test eye'
both eyes equally
the cobalt blue filter
A Schirmer's test of 10 mm or more is considered normal.

50. When performing a brightness acuity glare test - it is best to do which of the following?
with the central cornea
pressing on the globe too hard with the probe
Allow the patient to adjust to the light level before reading the letters.
reflex tears