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Certified Ophthalmic Assistant

Subjects : certifications, health-sciences

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. In evaluating an axial length scan - the retinal echo must be...
more males than females
one-fourth
IOL power
to the left of the scleral and orbital echoes

2. Illumination for the color plates test...
before starting school
one-fourth
varies according to the type of test administered
the patient should be tested with near correction - if worn

3. Just prior to the beginning of the TBUT test - the patient is instructed to...
blink
IOL power
for screening purposes - such as job applications
can often be cured if the causative factor is eliminated

4. Almost all of the formulas for calculating IOL power...
are based on the same general equation
2.0 or more
to have little or no shadow
to the left of the scleral and orbital echoes

5. One of the keys in accurate pachymetry is...
'test eye'
reflex tears
2 to 3 seconds
holding the probe perpendicular to the corneal surface

6. When calculating IOL power - each of the following are necessary except...
white to white corneal diameter
both eyes equally
normal tearing
the cobalt blue filter

7. When using color plates - a score indicates abnormal color vision...
varies according to the type of test
shortened axial length due to compression
545 pm
0.3 mm

8. It is important to estimate the anterior chamber depth prior to dilation because...
the appearance of dry spots
narrow angles may precipitate an angle-closure glaucoma attack
central corneal thickness
A Schirmer's test of 10 mm or more is considered normal.

9. This is not evaluated using rose Bengal except...
A Schirmer's test of 10 mm or more is considered normal.
are based on the same general equation
the cobalt blue filter
corneal endothelial drop-out

10. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
suspected acquired color defect
patients who have had corneal refractive surgery
20
IOL power

11. When performing the TBUT test - the observer is looking for...
can often be cured if the causative factor is eliminated
2 to 3 seconds
10 seconds
the appearance of dry spots

12. The photosensitive pigments of the eye are sensitive to...
pressing on the globe too hard with the probe
5 minutes
red - green - and blue
the cobalt blue filter

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

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14. The difference between Schirmer's test I and II is...
the use of an anesthetic
the cobalt blue filter
23 to 24 mm
red - green - and blue

15. The ideal IOLMaster axial length graph is...
the cobalt blue filter
20
a tall - central spike with only one peak and smaller spikes on either site
reflex tears

16. The Ishihara color plates are useful...
can often be cured if the causative factor is eliminated
corneal endothelial drop-out
for screening purposes - such as job applications
is acceptable

17. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
10 seconds
white to white corneal diameter
patients who have had corneal refractive surgery
the defect tends to remain stable over time

18. Schirmer's test I is used to measure...
reflex tears
narrow angles may precipitate an angle-closure glaucoma attack
expensive equipment
the defect tends to remain stable over time

19. Acquired color vision defects...
IOL power
10 seconds
the patient should be tested with near correction - if worn
can often be cured if the causative factor is eliminated

20. Young children can be tested using the color plates by...
severe dry eye
having them trace the number/figure
patients who have had corneal refractive surgery
reflex tears

21. Which of the following should be color-vision tested one eye at a time?
infrared
suspected acquired color defect
ultrasound
a staining agent

22. When performing a brightness acuity glare test - it is best to do which of the following?
Allow the patient to adjust to the light level before reading the letters.
tear filter papers
the use of an anesthetic
refractive error

23. Hereditary color defects most often fall into which category?
red-green
refractive error
varies according to the type of test
a tall - central spike with only one peak and smaller spikes on either site

24. Estimating the anterior chamber depth with a penlight works because...
a narrow angle and bowed iris cast a shadow on the iris
to have little or no shadow
the cobalt blue filter
a malingerer may invent a number - thus identifying him- or herself

25. A color plate that shows no obvious number to normal and abnormal alike is useful because...
10 seconds
more males than females
0.3 mm
a malingerer may invent a number - thus identifying him- or herself

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

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27. 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?
reading disabilities
one-fourth
a staining agent
2 to 3 seconds

28. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
both eyes equally
before starting school
5 minutes
shine the light flatly from the side - in the plane of the iris

29. With the 1OLMaster - the ideal signal-to-noise ratio is...
3.0 D
2.0 or more
a tall - central spike with only one peak and smaller spikes on either site
ultrasound

30. Measuring corneal thickness via nonoptical pachymetry involves the use of...
are based on the same general equation
red-green
ultrasound
a staining agent

31. Which eye structure is responsible for color vision?
shortened axial length due to compression
rods
545 pm
to have little or no shadow

32. Measuring time for the Schirmer's test is...
blink
with the central cornea
5 minutes
are based on the same general equation

33. 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)...
23 to 24 mm
is acceptable
A-constant
reflex tears

34. When performing pachymetry prior to refractive surgery - it is generally best to begin...
A Schirmer's test of 10 mm or more is considered normal.
patient wearing spectacles
10 seconds
with the central cornea

35. If a biometry instrument fails to calibrate properly - one should...
infrared
differentiate between congenital or acquired color blindness
the use of an anesthetic
remove the instrument from use

36. When calculating intraocular lens (IOL) powers - one must enter...
desired postoperative refraction
before starting school
the use of an anesthetic
posterior subcapsular cataract

37. The average central thickness of the human cornea is...
to the left of the scleral and orbital echoes
545 pm
the patient should be tested with near correction - if worn
narrow angles may precipitate an angle-closure glaucoma attack

38. Laser interferometry uses which type of laser light?
0.3 mm
rods
a narrow angle and bowed iris cast a shadow on the iris
infrared

39. Color vision testing is used to detect all of the following except...
differentiate between congenital or acquired color blindness
to have little or no shadow
IOL power
a malingerer may invent a number - thus identifying him- or herself

40. Hereditary color vision defects affect...
more males than females
the use of an anesthetic
white to white corneal diameter
narrow beam

41. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
expensive equipment
suspected acquired color defect
the defect tends to remain stable over time
ultrasound

42. A patient with which of the following potential diagnoses would be tested with bengal?
the appearance of dry spots
20
posterior subcapsular cataract
severe dry eye

43. 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?
are based on the same general equation
shortened axial length due to compression
varies according to the type of test administered
0.3 mm

44. The IOLMaster evaluates each of the following except...
to the left of the scleral and orbital echoes
refractive error
blink
can often be cured if the causative factor is eliminated

45. Rose bengal is...
is acceptable
ultrasound
a staining agent
that the sound beam is directed to the optic disc and the measurement is incorrect

46. _______ are not used in evaluating tear break-up time (TBUT)
tear filter papers
to the left of the scleral and orbital echoes
545 pm
that the sound beam is directed to the optic disc and the measurement is incorrect

47. An A-Sean can he artificially shortened due to...
pressing on the globe too hard with the probe
2.0 or more
having them trace the number/figure
to the left of the scleral and orbital echoes

48. Before proceeding with the actual color plate test...
23 to 24 mm
posterior subcapsular cataract
the patient is shown a sample that is discernable to normal and abnormal alike
narrow beam

49. The IOLMaster eliminates which of the following sources of error?
shortened axial length due to compression
severe dry eye
red-green
patients who have had corneal refractive surgery

50. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
that the sound beam is directed to the optic disc and the measurement is incorrect
narrow beam
23 to 24 mm
to have little or no shadow

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Certified Ophthalmic Assistant

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