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...
2 to 3 seconds
pressing on the globe too hard with the probe
A-constant
that the sound beam is directed to the optic disc and the measurement is incorrect

2. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
with the central cornea
20
reflex tears
having them trace the number/figure

3. When should a child have his or her color vision checked?
before starting school
is acceptable
can often be cured if the causative factor is eliminated
differentiate between congenital or acquired color blindness

4. 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
shortened axial length due to compression
tear filter papers

5. When calculating IOL power - each of the following are necessary except...
white to white corneal diameter
severe dry eye
patients who have had corneal refractive surgery
suspected acquired color defect

6. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
A-constant
both eyes equally
patients who have had corneal refractive surgery
with the central cornea

7. Measuring corneal thickness via nonoptical pachymetry involves the use of...
ultrasound
blink
central corneal thickness
white to white corneal diameter

8. 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)...
both eyes equally
the use of an anesthetic
A-constant
refractive surgery

9. _______ are not used in evaluating tear break-up time (TBUT)
infrared
tear filter papers
that the sound beam is directed to the optic disc and the measurement is incorrect
focus can he moved off-axis to obtain a clear reading

10. The IOLMaster evaluates each of the following except...
refractive error
expensive equipment
normal tearing
focus can he moved off-axis to obtain a clear reading

11. In evaluating an axial length scan - the retinal echo must be...
both eyes equally
varies according to the type of test
to the left of the scleral and orbital echoes
Allow the patient to adjust to the light level before reading the letters.

12. 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
suspected acquired color defect
more males than females
10 seconds

13. Schirmer's test I is used to measure...
shine the light flatly from the side - in the plane of the iris
reflex tears
that the sound beam is directed to the optic disc and the measurement is incorrect
white to white corneal diameter

14. The axial length of an average adult eye is...
reflex tears
refractive surgery
Allow the patient to adjust to the light level before reading the letters.
23 to 24 mm

15. When calculating intraocular lens (IOL) powers - one must enter...
both eyes equally
2 to 3 seconds
desired postoperative refraction
pressing on the globe too hard with the probe

16. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
A Schirmer's test of 10 mm or more is considered normal.
infrared
can often be cured if the causative factor is eliminated
the defect tends to remain stable over time

17. The Ishihara color plates are useful...
for screening purposes - such as job applications
a staining agent
Allow the patient to adjust to the light level before reading the letters.
tear filter papers

18. The IOLMaster eliminates which of the following sources of error?
tear filter papers
shortened axial length due to compression
a staining agent
0.3 mm

19. Schirmer's test II is used to measure...
for screening purposes - such as job applications
normal tearing
suspected acquired color defect
5 minutes

20. If a biometry instrument fails to calibrate properly - one should...
ultrasound
decrease in vision due to glare conditions
the patient is shown a sample that is discernable to normal and abnormal alike
remove the instrument from use

21. Before proceeding with the actual color plate test...
that the sound beam is directed to the optic disc and the measurement is incorrect
a narrow angle and bowed iris cast a shadow on the iris
refractive error
the patient is shown a sample that is discernable to normal and abnormal alike

22. Acquired color vision defects...
can often be cured if the causative factor is eliminated
to have little or no shadow
having them trace the number/figure
decrease in vision due to glare conditions

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

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24. Glare testing is used to identify...
decrease in vision due to glare conditions
shine the light flatly from the side - in the plane of the iris
reflex tears
tear filter papers

25. 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?
patients who have had corneal refractive surgery
one-fourth
suspected acquired color defect
pressing on the globe too hard with the probe

26. This is not evaluated using rose Bengal except...
ultrasound
corneal endothelial drop-out
decrease in vision due to glare conditions
0.3 mm

27. In test a patient with the color pseudoisochromatic plates...
blink
refractive surgery
20
the patient should be tested with near correction - if worn

28. How long should the patient be given to recognize the figure in a color plate?
2 to 3 seconds
ultrasound
pressing on the globe too hard with the probe
23 to 24 mm

29. When performing the TBUT test - the observer is looking for...
a narrow angle and bowed iris cast a shadow on the iris
23 to 24 mm
for screening purposes - such as job applications
the appearance of dry spots

30. An A-Sean can he artificially shortened due to...
remove the instrument from use
white to white corneal diameter
pressing on the globe too hard with the probe
is acceptable

31. The type of pachymetry used to evaluate a glaucoma suspect is...
central corneal thickness
refractive error
white to white corneal diameter
tear filter papers

32. Pachymetry readings are routinely taken prior to...
corneal endothelial drop-out
refractive surgery
pressing on the globe too hard with the probe
'test eye'

33. Rose bengal is...
a narrow angle and bowed iris cast a shadow on the iris
a staining agent
both eyes equally
5 minutes

34. Almost all of the formulas for calculating IOL power...
are based on the same general equation
expensive equipment
before starting school
10 seconds

35. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
before starting school
3.0 D
a malingerer may invent a number - thus identifying him- or herself
both eyes equally

36. Illumination for the color plates test...
varies according to the type of test administered
blink
focus can he moved off-axis to obtain a clear reading
reading disabilities

37. Laser interferometry uses which type of laser light?
the cobalt blue filter
0.3 mm
infrared
A Schirmer's test of 10 mm or more is considered normal.

38. When positioning the IOLMaster for the axial length reading...
corneal endothelial drop-out
can often be cured if the causative factor is eliminated
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

39. The difference between Schirmer's test I and II is...
shine the light flatly from the side - in the plane of the iris
5 minutes
the use of an anesthetic
0.3 mm

40. A TBUT of which of the following would indicate tear film dysfunction?
10 seconds
both eyes equally
ultrasound
23 to 24 mm

41. When using color plates - a score indicates abnormal color vision...
the cobalt blue filter
both eyes equally
the appearance of dry spots
varies according to the type of test

42. Just prior to the beginning of the TBUT test - the patient is instructed to...
blink
reading disabilities
the cobalt blue filter
A Schirmer's test of 10 mm or more is considered normal.

43. When performing pachymetry prior to refractive surgery - it is generally best to begin...
blink
with the central cornea
the patient should be tested with near correction - if worn
red - green - and blue

44. 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?
refractive error
central corneal thickness
0.3 mm
varies according to the type of test administered

45. When performing a brightness acuity glare test - it is best to do which of the following?
are based on the same general equation
Allow the patient to adjust to the light level before reading the letters.
normal tearing
white to white corneal diameter

46. When using a penlight to estimate anterior chamber depth - an open angle would appear...
holding the probe perpendicular to the corneal surface
remove the instrument from use
to have little or no shadow
A-constant

47. The average central thickness of the human cornea is...
corneal endothelial drop-out
545 pm
'test eye'
2 to 3 seconds

48. Color vision defects in children are frequently detected among those with...
expensive equipment
A-constant
reading disabilities
23 to 24 mm

49. A rose bengal does not require the use of...
the cobalt blue filter
with the central cornea
the appearance of dry spots
red-green

50. It is important to estimate the anterior chamber depth prior to dilation because...
narrow angles may precipitate an angle-closure glaucoma attack
to the left of the scleral and orbital echoes
corneal endothelial drop-out
dacryocystitis