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
IOL power
tear filter papers
to the left of the scleral and orbital echoes

2. Pachymetry readings are routinely taken prior to...
holding the probe perpendicular to the corneal surface
refractive surgery
A-constant
one-fourth

3. Rose bengal is...
narrow angles may precipitate an angle-closure glaucoma attack
the patient should be tested with near correction - if worn
a staining agent
red - green - and blue

4. Color vision testing is used to detect all of the following except...
for screening purposes - such as job applications
differentiate between congenital or acquired color blindness
remove the instrument from use
a tall - central spike with only one peak and smaller spikes on either site

5. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
corneal endothelial drop-out
is acceptable
patient wearing spectacles
infrared

6. Hereditary color defects most often fall into which category?
red-green
having them trace the number/figure
ultrasound
both eyes equally

7. When calculating intraocular lens (IOL) powers - one must enter...
that the sound beam is directed to the optic disc and the measurement is incorrect
desired postoperative refraction
having them trace the number/figure
refractive surgery

8. Which eye structure is responsible for color vision?
the patient is shown a sample that is discernable to normal and abnormal alike
the cobalt blue filter
rods
both eyes equally

9. Just prior to the beginning of the TBUT test - the patient is instructed to...
red-green
A-constant
that the sound beam is directed to the optic disc and the measurement is incorrect
blink

10. Schirmer's test I is used to measure...
is acceptable
for screening purposes - such as job applications
reflex tears
central corneal thickness

11. The Schirmer's test might be indicated in all of the following except...
remove the instrument from use
is acceptable
suspected acquired color defect
dacryocystitis

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

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13. Schirmer's test does not require _____ except Test strips
expensive equipment
can often be cured if the causative factor is eliminated
red - green - and blue
with the central cornea

14. When using color plates - a score indicates abnormal color vision...
remove the instrument from use
10 seconds
is acceptable
varies according to the type of test

15. 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?
0.3 mm
infrared
the patient is shown a sample that is discernable to normal and abnormal alike
severe dry eye

16. A rose bengal does not require the use of...
can often be cured if the causative factor is eliminated
suspected acquired color defect
the cobalt blue filter
narrow angles may precipitate an angle-closure glaucoma attack

17. Color vision defects in children are frequently detected among those with...
A-constant
patients who have had corneal refractive surgery
reading disabilities
before starting school

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

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19. One of the keys in accurate pachymetry is...
holding the probe perpendicular to the corneal surface
patient wearing spectacles
central corneal thickness
both eyes equally

20. A TBUT of which of the following would indicate tear film dysfunction?
10 seconds
the cobalt blue filter
more males than females
red - green - and blue

21. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
narrow beam
5 minutes
dacryocystitis
rods

22. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
blink
patients who have had corneal refractive surgery
3.0 D
expensive equipment

23. Acquired color vision defects...
refractive surgery
can often be cured if the causative factor is eliminated
suspected acquired color defect
remove the instrument from use

24. Hereditary color vision defects usually affect...
545 pm
both eyes equally
5 minutes
dacryocystitis

25. In evaluating an axial length scan - the retinal echo must be...
desired postoperative refraction
to the left of the scleral and orbital echoes
that the sound beam is directed to the optic disc and the measurement is incorrect
can often be cured if the causative factor is eliminated

26. 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
posterior subcapsular cataract
before starting school
holding the probe perpendicular to the corneal surface

27. An A-Sean can he artificially shortened due to...
refractive surgery
is acceptable
pressing on the globe too hard with the probe
both eyes equally

28. _______ are not used in evaluating tear break-up time (TBUT)
red-green
tear filter papers
Allow the patient to adjust to the light level before reading the letters.
'test eye'

29. When performing a brightness acuity glare test - it is best to do which of the following?
both eyes equally
the patient should be tested with near correction - if worn
that the sound beam is directed to the optic disc and the measurement is incorrect
Allow the patient to adjust to the light level before reading the letters.

30. The Ishihara color plates are useful...
central corneal thickness
corneal endothelial drop-out
the cobalt blue filter
for screening purposes - such as job applications

31. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
normal tearing
decrease in vision due to glare conditions
patients who have had corneal refractive surgery
IOL power

32. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
refractive surgery
'test eye'
refractive error
20

33. If a biometry instrument fails to calibrate properly - one should...
3.0 D
the patient should be tested with near correction - if worn
the appearance of dry spots
remove the instrument from use

34. Illumination for the color plates test...
corneal endothelial drop-out
3.0 D
varies according to the type of test administered
suspected acquired color defect

35. Measuring corneal thickness via nonoptical pachymetry involves the use of...
holding the probe perpendicular to the corneal surface
one-fourth
ultrasound
shortened axial length due to compression

36. The ideal IOLMaster axial length graph is...
5 minutes
ultrasound
a tall - central spike with only one peak and smaller spikes on either site
with the central cornea

37. The axial length of an average adult eye is...
23 to 24 mm
shine the light flatly from the side - in the plane of the iris
the appearance of dry spots
narrow angles may precipitate an angle-closure glaucoma attack

38. Glare testing is used to identify...
5 minutes
white to white corneal diameter
infrared
decrease in vision due to glare conditions

39. Estimating the anterior chamber depth with a penlight works because...
dacryocystitis
a narrow angle and bowed iris cast a shadow on the iris
23 to 24 mm
varies according to the type of test administered

40. When using a penlight to estimate anterior chamber depth - an open angle would appear...
narrow beam
to have little or no shadow
is acceptable
0.3 mm

41. In test a patient with the color pseudoisochromatic plates...
varies according to the type of test
the patient should be tested with near correction - if worn
the defect tends to remain stable over time
suspected acquired color defect

42. A color plate that shows no obvious number to normal and abnormal alike is useful because...
one-fourth
a malingerer may invent a number - thus identifying him- or herself
remove the instrument from use
the cobalt blue filter

43. The type of pachymetry used to evaluate a glaucoma suspect is...
focus can he moved off-axis to obtain a clear reading
central corneal thickness
shine the light flatly from the side - in the plane of the iris
reflex tears

44. The axial length of the eye is important in the calculation of...
IOL power
for screening purposes - such as job applications
desired postoperative refraction
severe dry eye

45. In which of the following would glare testing be most appropriate?
severe dry eye
posterior subcapsular cataract
are based on the same general equation
0.3 mm

46. When performing pachymetry prior to refractive surgery - it is generally best to begin...
that the sound beam is directed to the optic disc and the measurement is incorrect
10 seconds
expensive equipment
with the central cornea

47. Before proceeding with the actual color plate test...
the patient is shown a sample that is discernable to normal and abnormal alike
tear filter papers
infrared
white to white corneal diameter

48. A patient with which of the following potential diagnoses would be tested with bengal?
severe dry eye
infrared
red - green - and blue
the appearance of dry spots

49. This is not evaluated using rose Bengal except...
narrow beam
holding the probe perpendicular to the corneal surface
patients who have had corneal refractive surgery
corneal endothelial drop-out

50. When should a child have his or her color vision checked?
the cobalt blue filter
blink
before starting school
a tall - central spike with only one peak and smaller spikes on either site