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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. A TBUT of which of the following would indicate tear film dysfunction?
narrow beam
shortened axial length due to compression
reflex tears
10 seconds

2. 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)...
tear filter papers
the patient should be tested with near correction - if worn
for screening purposes - such as job applications
A-constant

3. In evaluating an axial length scan - the retinal echo must be...
20
suspected acquired color defect
pressing on the globe too hard with the probe
to the left of the scleral and orbital echoes

4. Measuring time for the Schirmer's test is...
blink
refractive error
the appearance of dry spots
5 minutes

5. Young children can be tested using the color plates by...
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
differentiate between congenital or acquired color blindness
having them trace the number/figure

6. Schirmer's test II is used to measure...
20
normal tearing
before starting school
shortened axial length due to compression

7. Pachymetry readings are routinely taken prior to...
tear filter papers
refractive surgery
shine the light flatly from the side - in the plane of the iris
to the left of the scleral and orbital echoes

8. Schirmer's test does not require _____ except Test strips
expensive equipment
shine the light flatly from the side - in the plane of the iris
patients who have had corneal refractive surgery
posterior subcapsular cataract

9. When positioning the IOLMaster for the axial length reading...
normal tearing
infrared
refractive error
focus can he moved off-axis to obtain a clear reading

10. How long should the patient be given to recognize the figure in a color plate?
reflex tears
2 to 3 seconds
patient wearing spectacles
20

11. With the 1OLMaster - the ideal signal-to-noise ratio is...
rods
expensive equipment
2.0 or more
A Schirmer's test of 10 mm or more is considered normal.

12. The IOLMaster eliminates which of the following sources of error?
IOL power
pressing on the globe too hard with the probe
refractive surgery
shortened axial length due to compression

13. Estimating the anterior chamber depth with a penlight works because...
shortened axial length due to compression
posterior subcapsular cataract
with the central cornea
a narrow angle and bowed iris cast a shadow on the iris

14. When using a penlight to estimate anterior chamber depth - an open angle would appear...
to have little or no shadow
a malingerer may invent a number - thus identifying him- or herself
the appearance of dry spots
that the sound beam is directed to the optic disc and the measurement is incorrect

15. The photosensitive pigments of the eye are sensitive to...
red - green - and blue
tear filter papers
infrared
the patient should be tested with near correction - if worn

16. Hereditary color defects most often fall into which category?
red-green
refractive error
one-fourth
rods

17. _______ are not used in evaluating tear break-up time (TBUT)
both eyes equally
tear filter papers
0.3 mm
patient wearing spectacles

18. Almost all of the formulas for calculating IOL power...
suspected acquired color defect
are based on the same general equation
tear filter papers
2.0 or more

19. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
shine the light flatly from the side - in the plane of the iris
Allow the patient to adjust to the light level before reading the letters.
20
tear filter papers

20. Laser interferometry uses which type of laser light?
remove the instrument from use
varies according to the type of test administered
infrared
23 to 24 mm

21. Color vision testing is used to detect all of the following except...
decrease in vision due to glare conditions
holding the probe perpendicular to the corneal surface
differentiate between congenital or acquired color blindness
the use of an anesthetic

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

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23. Just prior to the beginning of the TBUT test - the patient is instructed to...
posterior subcapsular cataract
blink
23 to 24 mm
expensive equipment

24. 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?
pressing on the globe too hard with the probe
to the left of the scleral and orbital echoes
holding the probe perpendicular to the corneal surface
one-fourth

25. The Schirmer's test might be indicated in all of the following except...
the appearance of dry spots
dacryocystitis
Allow the patient to adjust to the light level before reading the letters.
patient wearing spectacles

26. Color vision defects in children are frequently detected among those with...
narrow angles may precipitate an angle-closure glaucoma attack
reading disabilities
differentiate between congenital or acquired color blindness
the appearance of dry spots

27. Illumination for the color plates test...
patients who have had corneal refractive surgery
varies according to the type of test administered
are based on the same general equation
with the central cornea

28. If a biometry instrument fails to calibrate properly - one should...
having them trace the number/figure
remove the instrument from use
a tall - central spike with only one peak and smaller spikes on either site
the cobalt blue filter

29. The axial length of an average adult eye is...
a narrow angle and bowed iris cast a shadow on the iris
normal tearing
a staining agent
23 to 24 mm

30. Measuring corneal thickness via nonoptical pachymetry involves the use of...
patient wearing spectacles
the use of an anesthetic
is acceptable
ultrasound

31. In test a patient with the color pseudoisochromatic plates...
differentiate between congenital or acquired color blindness
a malingerer may invent a number - thus identifying him- or herself
the patient should be tested with near correction - if worn
20

32. It is important to estimate the anterior chamber depth prior to dilation because...
reading disabilities
IOL power
are based on the same general equation
narrow angles may precipitate an angle-closure glaucoma attack

33. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
holding the probe perpendicular to the corneal surface
patients who have had corneal refractive surgery
the appearance of dry spots
to have little or no shadow

34. The ideal IOLMaster axial length graph is...
a tall - central spike with only one peak and smaller spikes on either site
A Schirmer's test of 10 mm or more is considered normal.
reading disabilities
focus can he moved off-axis to obtain a clear reading

35. One of the keys in accurate pachymetry is...
holding the probe perpendicular to the corneal surface
narrow beam
the patient should be tested with near correction - if worn
A-constant

36. Hereditary color vision defects affect...
to the left of the scleral and orbital echoes
more males than females
both eyes equally
suspected acquired color defect

37. 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?
for screening purposes - such as job applications
a staining agent
3.0 D
0.3 mm

38. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
one-fourth
narrow beam
posterior subcapsular cataract
2 to 3 seconds

39. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
the defect tends to remain stable over time
are based on the same general equation
'test eye'
infrared

40. Before proceeding with the actual color plate test...
the patient is shown a sample that is discernable to normal and abnormal alike
A Schirmer's test of 10 mm or more is considered normal.
to the left of the scleral and orbital echoes
reflex tears

41. When calculating intraocular lens (IOL) powers - one must enter...
shine the light flatly from the side - in the plane of the iris
both eyes equally
desired postoperative refraction
narrow angles may precipitate an angle-closure glaucoma attack

42. A color plate that shows no obvious number to normal and abnormal alike is useful because...
that the sound beam is directed to the optic disc and the measurement is incorrect
varies according to the type of test administered
A-constant
a malingerer may invent a number - thus identifying him- or herself

43. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
the patient should be tested with near correction - if worn
refractive error
3.0 D
ultrasound

44. The difference between Schirmer's test I and II is...
tear filter papers
the use of an anesthetic
with the central cornea
more males than females

45. Which eye structure is responsible for color vision?
narrow angles may precipitate an angle-closure glaucoma attack
A-constant
pressing on the globe too hard with the probe
rods

46. The average central thickness of the human cornea is...
a narrow angle and bowed iris cast a shadow on the iris
545 pm
decrease in vision due to glare conditions
blink

47. In which of the following would glare testing be most appropriate?
2 to 3 seconds
posterior subcapsular cataract
A Schirmer's test of 10 mm or more is considered normal.
desired postoperative refraction

48. A patient with which of the following potential diagnoses would be tested with bengal?
2 to 3 seconds
refractive error
severe dry eye
suspected acquired color defect

49. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
'test eye'
can often be cured if the causative factor is eliminated
A Schirmer's test of 10 mm or more is considered normal.
patient wearing spectacles

50. Hereditary color vision defects usually affect...
reflex tears
both eyes equally
rods
to the left of the scleral and orbital echoes

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Certified Ophthalmic Assistant

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