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 average central thickness of the human cornea is...
differentiate between congenital or acquired color blindness
545 pm
decrease in vision due to glare conditions
red-green

2. Almost all of the formulas for calculating IOL power...
are based on the same general equation
a staining agent
the patient is shown a sample that is discernable to normal and abnormal alike
can often be cured if the causative factor is eliminated

3. When using a penlight to estimate anterior chamber depth - an open angle would appear...
white to white corneal diameter
expensive equipment
decrease in vision due to glare conditions
to have little or no shadow

4. Young children can be tested using the color plates by...
posterior subcapsular cataract
differentiate between congenital or acquired color blindness
having them trace the number/figure
ultrasound

5. Measuring corneal thickness via nonoptical pachymetry involves the use of...
shine the light flatly from the side - in the plane of the iris
ultrasound
reflex tears
5 minutes

6. Illumination for the color plates test...
varies according to the type of test administered
desired postoperative refraction
Allow the patient to adjust to the light level before reading the letters.
red - green - and blue

7. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
shine the light flatly from the side - in the plane of the iris
patients who have had corneal refractive surgery
corneal endothelial drop-out
ultrasound

8. Color vision testing is used to detect all of the following except...
rods
suspected acquired color defect
differentiate between congenital or acquired color blindness
the patient is shown a sample that is discernable to normal and abnormal alike

9. 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
rods
normal tearing
'test eye'

10. 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...
infrared
central corneal thickness
that the sound beam is directed to the optic disc and the measurement is incorrect
holding the probe perpendicular to the corneal surface

11. When calculating IOL power - each of the following are necessary except...
the patient should be tested with near correction - if worn
tear filter papers
refractive surgery
white to white corneal diameter

12. How long should the patient be given to recognize the figure in a color plate?
the patient should be tested with near correction - if worn
varies according to the type of test administered
2 to 3 seconds
severe dry eye

13. _______ are not used in evaluating tear break-up time (TBUT)
A Schirmer's test of 10 mm or more is considered normal.
tear filter papers
ultrasound
a narrow angle and bowed iris cast a shadow on the iris

14. In test a patient with the color pseudoisochromatic plates...
the patient should be tested with near correction - if worn
10 seconds
varies according to the type of test administered
20

15. With the 1OLMaster - the ideal signal-to-noise ratio is...
red-green
the appearance of dry spots
a malingerer may invent a number - thus identifying him- or herself
2.0 or more

16. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
patient wearing spectacles
with the central cornea
is acceptable
the cobalt blue filter

17. In which of the following would glare testing be most appropriate?
posterior subcapsular cataract
central corneal thickness
10 seconds
having them trace the number/figure

18. If a biometry instrument fails to calibrate properly - one should...
remove the instrument from use
differentiate between congenital or acquired color blindness
Allow the patient to adjust to the light level before reading the letters.
the defect tends to remain stable over time

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

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20. The type of pachymetry used to evaluate a glaucoma suspect is...
central corneal thickness
decrease in vision due to glare conditions
pressing on the globe too hard with the probe
holding the probe perpendicular to the corneal surface

21. The IOLMaster evaluates each of the following except...
refractive error
red-green
reflex tears
normal tearing

22. Hereditary color vision defects usually affect...
narrow angles may precipitate an angle-closure glaucoma attack
both eyes equally
tear filter papers
having them trace the number/figure

23. Acquired color vision defects...
posterior subcapsular cataract
can often be cured if the causative factor is eliminated
tear filter papers
2.0 or more

24. The Ishihara color plates are useful...
before starting school
blink
for screening purposes - such as job applications
a staining agent

25. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
before starting school
a malingerer may invent a number - thus identifying him- or herself
IOL power
20

26. An A-Sean can he artificially shortened due to...
pressing on the globe too hard with the probe
patient wearing spectacles
'test eye'
20

27. Measuring time for the Schirmer's test is...
the defect tends to remain stable over time
infrared
shine the light flatly from the side - in the plane of the iris
5 minutes

28. When positioning the IOLMaster for the axial length reading...
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
patients who have had corneal refractive surgery
2.0 or more

29. A patient with which of the following potential diagnoses would be tested with bengal?
severe dry eye
patient wearing spectacles
decrease in vision due to glare conditions
the cobalt blue filter

30. Schirmer's test I is used to measure...
the patient is shown a sample that is discernable to normal and abnormal alike
3.0 D
the cobalt blue filter
reflex tears

31. 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)...
a tall - central spike with only one peak and smaller spikes on either site
2.0 or more
both eyes equally
A-constant

32. Color vision defects in children are frequently detected among those with...
reading disabilities
desired postoperative refraction
holding the probe perpendicular to the corneal surface
the use of an anesthetic

33. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
infrared
one-fourth
narrow beam
2 to 3 seconds

34. The IOLMaster eliminates which of the following sources of error?
reading disabilities
shortened axial length due to compression
narrow beam
23 to 24 mm

35. When performing the TBUT test - the observer is looking for...
to have little or no shadow
the appearance of dry spots
normal tearing
a narrow angle and bowed iris cast a shadow on the iris

36. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
more males than females
shine the light flatly from the side - in the plane of the iris
pressing on the globe too hard with the probe
2 to 3 seconds

37. The Schirmer's test might be indicated in all of the following except...
tear filter papers
red-green
dacryocystitis
3.0 D

38. Pachymetry readings are routinely taken prior to...
varies according to the type of test
shortened axial length due to compression
refractive surgery
both eyes equally

39. Hereditary color vision defects affect...
more males than females
corneal endothelial drop-out
tear filter papers
rods

40. When performing a brightness acuity glare test - it is best to do which of the following?
A Schirmer's test of 10 mm or more is considered normal.
Allow the patient to adjust to the light level before reading the letters.
that the sound beam is directed to the optic disc and the measurement is incorrect
a malingerer may invent a number - thus identifying him- or herself

41. Schirmer's test does not require _____ except Test strips
normal tearing
expensive equipment
Allow the patient to adjust to the light level before reading the letters.
can often be cured if the causative factor is eliminated

42. In evaluating an axial length scan - the retinal echo must be...
to the left of the scleral and orbital echoes
IOL power
20
more males than females

43. The axial length of the eye is important in the calculation of...
red - green - and blue
A-constant
IOL power
shine the light flatly from the side - in the plane of the iris

44. Just prior to the beginning of the TBUT test - the patient is instructed to...
blink
corneal endothelial drop-out
20
infrared

45. A TBUT of which of the following would indicate tear film dysfunction?
the patient should be tested with near correction - if worn
blink
10 seconds
white to white corneal diameter

46. Rose bengal is...
the defect tends to remain stable over time
a staining agent
is acceptable
to have little or no shadow

47. The ideal IOLMaster axial length graph is...
a tall - central spike with only one peak and smaller spikes on either site
normal tearing
blink
refractive error

48. It is important to estimate the anterior chamber depth prior to dilation because...
a tall - central spike with only one peak and smaller spikes on either site
severe dry eye
narrow angles may precipitate an angle-closure glaucoma attack
rods

49. Laser interferometry uses which type of laser light?
infrared
desired postoperative refraction
reflex tears
20

50. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
infrared
tear filter papers
patient wearing spectacles
both eyes equally