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 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?
red-green
one-fourth
A Schirmer's test of 10 mm or more is considered normal.
that the sound beam is directed to the optic disc and the measurement is incorrect

2. Color vision testing is used to detect all of the following except...
shortened axial length due to compression
reflex tears
a tall - central spike with only one peak and smaller spikes on either site
differentiate between congenital or acquired color blindness

3. Color vision defects in children are frequently detected among those with...
refractive error
reading disabilities
can often be cured if the causative factor is eliminated
suspected acquired color defect

4. Measuring corneal thickness via nonoptical pachymetry involves the use of...
with the central cornea
having them trace the number/figure
expensive equipment
ultrasound

5. A patient with which of the following potential diagnoses would be tested with bengal?
suspected acquired color defect
severe dry eye
that the sound beam is directed to the optic disc and the measurement is incorrect
A-constant

6. In evaluating an axial length scan - the retinal echo must be...
545 pm
before starting school
to the left of the scleral and orbital echoes
differentiate between congenital or acquired color blindness

7. In test a patient with the color pseudoisochromatic plates...
ultrasound
23 to 24 mm
the patient should be tested with near correction - if worn
red - green - and blue

8. When performing the TBUT test - the observer is looking for...
normal tearing
0.3 mm
IOL power
the appearance of dry spots

9. The IOLMaster eliminates which of the following sources of error?
the appearance of dry spots
before starting school
shortened axial length due to compression
20

10. A color plate that shows no obvious number to normal and abnormal alike is useful because...
expensive equipment
a malingerer may invent a number - thus identifying him- or herself
a staining agent
the appearance of dry spots

11. The axial length of an average adult eye is...
reflex tears
Allow the patient to adjust to the light level before reading the letters.
are based on the same general equation
23 to 24 mm

12. _______ are not used in evaluating tear break-up time (TBUT)
to the left of the scleral and orbital echoes
infrared
the cobalt blue filter
tear filter papers

13. When positioning the IOLMaster for the axial length reading...
for screening purposes - such as job applications
infrared
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

14. A rose bengal does not require the use of...
corneal endothelial drop-out
the cobalt blue filter
suspected acquired color defect
to have little or no shadow

15. 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...
corneal endothelial drop-out
that the sound beam is directed to the optic disc and the measurement is incorrect
is acceptable
A-constant

16. The difference between Schirmer's test I and II is...
infrared
suspected acquired color defect
corneal endothelial drop-out
the use of an anesthetic

17. It is important to estimate the anterior chamber depth prior to dilation because...
narrow angles may precipitate an angle-closure glaucoma attack
with the central cornea
rods
the patient should be tested with near correction - if worn

18. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
'test eye'
patient wearing spectacles
is acceptable
remove the instrument from use

19. The Ishihara color plates are useful...
desired postoperative refraction
the use of an anesthetic
for screening purposes - such as job applications
suspected acquired color defect

20. Schirmer's test does not require _____ except Test strips
before starting school
infrared
one-fourth
expensive equipment

21. The average central thickness of the human cornea is...
545 pm
are based on the same general equation
dacryocystitis
for screening purposes - such as job applications

22. The ideal IOLMaster axial length graph is...
reading disabilities
a tall - central spike with only one peak and smaller spikes on either site
5 minutes
A Schirmer's test of 10 mm or more is considered normal.

23. The photosensitive pigments of the eye are sensitive to...
red - green - and blue
the use of an anesthetic
severe dry eye
0.3 mm

24. In which of the following would glare testing be most appropriate?
2.0 or more
the cobalt blue filter
posterior subcapsular cataract
refractive surgery

25. Young children can be tested using the color plates by...
0.3 mm
narrow beam
having them trace the number/figure
normal tearing

26. If a biometry instrument fails to calibrate properly - one should...
remove the instrument from use
both eyes equally
IOL power
pressing on the globe too hard with the probe

27. Estimating the anterior chamber depth with a penlight works because...
a narrow angle and bowed iris cast a shadow on the iris
are based on the same general equation
pressing on the globe too hard with the probe
rods

28. How long should the patient be given to recognize the figure in a color plate?
decrease in vision due to glare conditions
ultrasound
2 to 3 seconds
545 pm

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

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30. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
with the central cornea
rods
to the left of the scleral and orbital echoes
narrow beam

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

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32. Acquired color vision defects...
a narrow angle and bowed iris cast a shadow on the iris
5 minutes
can often be cured if the causative factor is eliminated
A-constant

33. The Schirmer's test might be indicated in all of the following except...
having them trace the number/figure
suspected acquired color defect
dacryocystitis
normal tearing

34. 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)...
central corneal thickness
blink
suspected acquired color defect
A-constant

35. A TBUT of which of the following would indicate tear film dysfunction?
10 seconds
tear filter papers
patient wearing spectacles
2 to 3 seconds

36. Which of the following should be color-vision tested one eye at a time?
the use of an anesthetic
the cobalt blue filter
to have little or no shadow
suspected acquired color defect

37. An A-Sean can he artificially shortened due to...
pressing on the globe too hard with the probe
the defect tends to remain stable over time
3.0 D
20

38. When calculating intraocular lens (IOL) powers - one must enter...
desired postoperative refraction
decrease in vision due to glare conditions
A Schirmer's test of 10 mm or more is considered normal.
reflex tears

39. When calculating IOL power - each of the following are necessary except...
white to white corneal diameter
5 minutes
posterior subcapsular cataract
IOL power

40. Which eye structure is responsible for color vision?
rods
corneal endothelial drop-out
can often be cured if the causative factor is eliminated
red-green

41. Before proceeding with the actual color plate test...
dacryocystitis
the patient is shown a sample that is discernable to normal and abnormal alike
is acceptable
to the left of the scleral and orbital echoes

42. The IOLMaster evaluates each of the following except...
refractive error
desired postoperative refraction
3.0 D
infrared

43. Laser interferometry uses which type of laser light?
10 seconds
the use of an anesthetic
infrared
decrease in vision due to glare conditions

44. Almost all of the formulas for calculating IOL power...
to have little or no shadow
the patient should be tested with near correction - if worn
3.0 D
are based on the same general equation

45. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
the appearance of dry spots
that the sound beam is directed to the optic disc and the measurement is incorrect
suspected acquired color defect
patients who have had corneal refractive surgery

46. When using color plates - a score indicates abnormal color vision...
infrared
posterior subcapsular cataract
varies according to the type of test
the appearance of dry spots

47. 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?
tear filter papers
23 to 24 mm
the appearance of dry spots
0.3 mm

48. Hereditary color vision defects usually affect...
both eyes equally
central corneal thickness
'test eye'
is acceptable

49. Measuring time for the Schirmer's test is...
that the sound beam is directed to the optic disc and the measurement is incorrect
shortened axial length due to compression
23 to 24 mm
5 minutes

50. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
a staining agent
blink
varies according to the type of test
shine the light flatly from the side - in the plane of the iris