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. 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...
that the sound beam is directed to the optic disc and the measurement is incorrect
23 to 24 mm
corneal endothelial drop-out
20

2. Young children can be tested using the color plates by...
2.0 or more
having them trace the number/figure
0.3 mm
ultrasound

3. Measuring corneal thickness via nonoptical pachymetry involves the use of...
23 to 24 mm
the appearance of dry spots
before starting school
ultrasound

4. In evaluating an axial length scan - the retinal echo must be...
10 seconds
for screening purposes - such as job applications
to the left of the scleral and orbital echoes
A Schirmer's test of 10 mm or more is considered normal.

5. Schirmer's test II is used to measure...
differentiate between congenital or acquired color blindness
patients who have had corneal refractive surgery
normal tearing
more males than females

6. When positioning the IOLMaster for the axial length reading...
holding the probe perpendicular to the corneal surface
severe dry eye
focus can he moved off-axis to obtain a clear reading
refractive error

7. Illumination for the color plates test...
refractive error
shortened axial length due to compression
2.0 or more
varies according to the type of test administered

8. 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?
red-green
ultrasound
0.3 mm
3.0 D

9. The Ishihara color plates are useful...
for screening purposes - such as job applications
the appearance of dry spots
expensive equipment
remove the instrument from use

10. One of the keys in accurate pachymetry is...
holding the probe perpendicular to the corneal surface
23 to 24 mm
narrow beam
can often be cured if the causative factor is eliminated

11. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
shine the light flatly from the side - in the plane of the iris
red - green - and blue
A-constant
reflex tears

12. Schirmer's test does not require _____ except Test strips
a staining agent
expensive equipment
0.3 mm
refractive error

13. The average central thickness of the human cornea is...
expensive equipment
545 pm
severe dry eye
the patient is shown a sample that is discernable to normal and abnormal alike

14. 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-constant
5 minutes
the cobalt blue filter
23 to 24 mm

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

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16. An A-Sean can he artificially shortened due to...
pressing on the globe too hard with the probe
holding the probe perpendicular to the corneal surface
is acceptable
to the left of the scleral and orbital echoes

17. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
central corneal thickness
20
the cobalt blue filter
the defect tends to remain stable over time

18. 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
ultrasound
Allow the patient to adjust to the light level before reading the letters.
are based on the same general equation

19. When performing the TBUT test - the observer is looking for...
the defect tends to remain stable over time
having them trace the number/figure
pressing on the globe too hard with the probe
the appearance of dry spots

20. When performing a brightness acuity glare test - it is best to do which of the following?
the appearance of dry spots
for screening purposes - such as job applications
to the left of the scleral and orbital echoes
Allow the patient to adjust to the light level before reading the letters.

21. When calculating intraocular lens (IOL) powers - one must enter...
desired postoperative refraction
central corneal thickness
varies according to the type of test
2 to 3 seconds

22. In which of the following would glare testing be most appropriate?
'test eye'
posterior subcapsular cataract
both eyes equally
blink

23. Rose bengal is...
a staining agent
dacryocystitis
differentiate between congenital or acquired color blindness
the use of an anesthetic

24. The difference between Schirmer's test I and II is...
the patient is shown a sample that is discernable to normal and abnormal alike
20
the use of an anesthetic
holding the probe perpendicular to the corneal surface

25. Color vision defects in children are frequently detected among those with...
suspected acquired color defect
10 seconds
reading disabilities
focus can he moved off-axis to obtain a clear reading

26. The photosensitive pigments of the eye are sensitive to...
tear filter papers
red - green - and blue
IOL power
both eyes equally

27. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
patients who have had corneal refractive surgery
2.0 or more
are based on the same general equation
ultrasound

28. Hereditary color defects most often fall into which category?
dacryocystitis
can often be cured if the causative factor is eliminated
red-green
5 minutes

29. A TBUT of which of the following would indicate tear film dysfunction?
normal tearing
10 seconds
pressing on the globe too hard with the probe
a tall - central spike with only one peak and smaller spikes on either site

30. Hereditary color vision defects affect...
more males than females
one-fourth
blink
the cobalt blue filter

31. Which eye structure is responsible for color vision?
remove the instrument from use
red - green - and blue
holding the probe perpendicular to the corneal surface
rods

32. When using a penlight to estimate anterior chamber depth - an open angle would appear...
to have little or no shadow
pressing on the globe too hard with the probe
a tall - central spike with only one peak and smaller spikes on either site
545 pm

33. If a biometry instrument fails to calibrate properly - one should...
is acceptable
remove the instrument from use
that the sound beam is directed to the optic disc and the measurement is incorrect
tear filter papers

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?
545 pm
one-fourth
10 seconds
patient wearing spectacles

35. When calculating IOL power - each of the following are necessary except...
narrow angles may precipitate an angle-closure glaucoma attack
white to white corneal diameter
patient wearing spectacles
posterior subcapsular cataract

36. Measuring time for the Schirmer's test is...
the use of an anesthetic
the cobalt blue filter
5 minutes
the patient should be tested with near correction - if worn

37. Glare testing is used to identify...
refractive error
to have little or no shadow
decrease in vision due to glare conditions
tear filter papers

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

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39. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
reading disabilities
the cobalt blue filter
the patient should be tested with near correction - if worn
is acceptable

40. Before proceeding with the actual color plate test...
varies according to the type of test administered
Allow the patient to adjust to the light level before reading the letters.
the patient is shown a sample that is discernable to normal and abnormal alike
tear filter papers

41. Almost all of the formulas for calculating IOL power...
3.0 D
2.0 or more
with the central cornea
are based on the same general equation

42. Which of the following should be color-vision tested one eye at a time?
infrared
suspected acquired color defect
tear filter papers
a tall - central spike with only one peak and smaller spikes on either site

43. A patient with which of the following potential diagnoses would be tested with bengal?
severe dry eye
dacryocystitis
reading disabilities
shortened axial length due to compression

44. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
the defect tends to remain stable over time
20
more males than females
a tall - central spike with only one peak and smaller spikes on either site

45. 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
IOL power
narrow angles may precipitate an angle-closure glaucoma attack
suspected acquired color defect

46. The type of pachymetry used to evaluate a glaucoma suspect is...
a tall - central spike with only one peak and smaller spikes on either site
central corneal thickness
reflex tears
10 seconds

47. The axial length of an average adult eye is...
with the central cornea
desired postoperative refraction
23 to 24 mm
normal tearing

48. Schirmer's test I is used to measure...
reflex tears
having them trace the number/figure
holding the probe perpendicular to the corneal surface
10 seconds

49. With the 1OLMaster - the ideal signal-to-noise ratio is...
2.0 or more
narrow angles may precipitate an angle-closure glaucoma attack
shortened axial length due to compression
a malingerer may invent a number - thus identifying him- or herself

50. This is not evaluated using rose Bengal except...
one-fourth
patient wearing spectacles
corneal endothelial drop-out
desired postoperative refraction