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. When using a penlight to estimate anterior chamber depth - an open angle would appear...
having them trace the number/figure
can often be cured if the causative factor is eliminated
blink
to have little or no shadow

2. Color vision testing is used to detect all of the following except...
differentiate between congenital or acquired color blindness
545 pm
the patient is shown a sample that is discernable to normal and abnormal alike
one-fourth

3. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
narrow beam
20
reflex tears
refractive error

4. The axial length of an average adult eye is...
corneal endothelial drop-out
shortened axial length due to compression
severe dry eye
23 to 24 mm

5. The ideal IOLMaster axial length graph is...
the cobalt blue filter
the patient should be tested with near correction - if worn
0.3 mm
a tall - central spike with only one peak and smaller spikes on either site

6. The difference between Schirmer's test I and II is...
differentiate between congenital or acquired color blindness
more males than females
545 pm
the use of an anesthetic

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

8. Schirmer's test II is used to measure...
focus can he moved off-axis to obtain a clear reading
patient wearing spectacles
normal tearing
a tall - central spike with only one peak and smaller spikes on either site

9. The Ishihara color plates are useful...
for screening purposes - such as job applications
A-constant
suspected acquired color defect
the patient is shown a sample that is discernable to normal and abnormal alike

10. When performing a brightness acuity glare test - it is best to do which of the following?
Allow the patient to adjust to the light level before reading the letters.
are based on the same general equation
one-fourth
a tall - central spike with only one peak and smaller spikes on either site

11. The axial length of the eye is important in the calculation of...
10 seconds
are based on the same general equation
IOL power
a tall - central spike with only one peak and smaller spikes on either site

12. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
is acceptable
for screening purposes - such as job applications
0.3 mm
normal tearing

13. An A-Sean can he artificially shortened due to...
refractive error
varies according to the type of test administered
pressing on the globe too hard with the probe
'test eye'

14. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
varies according to the type of test
the defect tends to remain stable over time
focus can he moved off-axis to obtain a clear reading
both eyes equally

15. Almost all of the formulas for calculating IOL power...
more males than females
suspected acquired color defect
are based on the same general equation
the use of an anesthetic

16. 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?
patient wearing spectacles
one-fourth
posterior subcapsular cataract
both eyes equally

17. When calculating IOL power - each of the following are necessary except...
central corneal thickness
ultrasound
white to white corneal diameter
pressing on the globe too hard with the probe

18. The IOLMaster evaluates each of the following except...
for screening purposes - such as job applications
the appearance of dry spots
refractive error
that the sound beam is directed to the optic disc and the measurement is incorrect

19. When calculating intraocular lens (IOL) powers - one must enter...
2 to 3 seconds
2.0 or more
desired postoperative refraction
infrared

20. 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...
before starting school
to have little or no shadow
the appearance of dry spots
that the sound beam is directed to the optic disc and the measurement is incorrect

21. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
corneal endothelial drop-out
2 to 3 seconds
focus can he moved off-axis to obtain a clear reading
narrow beam

22. _______ are not used in evaluating tear break-up time (TBUT)
tear filter papers
a narrow angle and bowed iris cast a shadow on the iris
is acceptable
the defect tends to remain stable over time

23. Acquired color vision defects...
IOL power
holding the probe perpendicular to the corneal surface
can often be cured if the causative factor is eliminated
3.0 D

24. 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
suspected acquired color defect
narrow beam
2.0 or more

25. Pachymetry readings are routinely taken prior to...
patients who have had corneal refractive surgery
refractive surgery
decrease in vision due to glare conditions
the patient should be tested with near correction - if worn

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)...
remove the instrument from use
to the left of the scleral and orbital echoes
posterior subcapsular cataract
A-constant

27. Color vision defects in children are frequently detected among those with...
a tall - central spike with only one peak and smaller spikes on either site
patients who have had corneal refractive surgery
reading disabilities
shine the light flatly from the side - in the plane of the iris

28. In test a patient with the color pseudoisochromatic plates...
for screening purposes - such as job applications
holding the probe perpendicular to the corneal surface
the patient should be tested with near correction - if worn
patients who have had corneal refractive surgery

29. 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?
a tall - central spike with only one peak and smaller spikes on either site
desired postoperative refraction
0.3 mm
a staining agent

30. Measuring time for the Schirmer's test is...
5 minutes
blink
can often be cured if the causative factor is eliminated
narrow angles may precipitate an angle-closure glaucoma attack

31. With the 1OLMaster - the ideal signal-to-noise ratio is...
the use of an anesthetic
narrow beam
2.0 or more
545 pm

32. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
focus can he moved off-axis to obtain a clear reading
patients who have had corneal refractive surgery
a malingerer may invent a number - thus identifying him- or herself
central corneal thickness

33. Hereditary color vision defects affect...
having them trace the number/figure
central corneal thickness
one-fourth
more males than females

34. Just prior to the beginning of the TBUT test - the patient is instructed to...
suspected acquired color defect
with the central cornea
blink
A-constant

35. Before proceeding with the actual color plate test...
the patient is shown a sample that is discernable to normal and abnormal alike
'test eye'
IOL power
with the central cornea

36. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
A Schirmer's test of 10 mm or more is considered normal.
the appearance of dry spots
shine the light flatly from the side - in the plane of the iris
before starting school

37. Estimating the anterior chamber depth with a penlight works because...
can often be cured if the causative factor is eliminated
the cobalt blue filter
a narrow angle and bowed iris cast a shadow on the iris
suspected acquired color defect

38. In evaluating an axial length scan - the retinal echo must be...
545 pm
the appearance of dry spots
to the left of the scleral and orbital echoes
patient wearing spectacles

39. It is important to estimate the anterior chamber depth prior to dilation because...
20
to the left of the scleral and orbital echoes
narrow angles may precipitate an angle-closure glaucoma attack
before starting school

40. The IOLMaster eliminates which of the following sources of error?
shortened axial length due to compression
shine the light flatly from the side - in the plane of the iris
to have little or no shadow
varies according to the type of test administered

41. In which of the following would glare testing be most appropriate?
posterior subcapsular cataract
a tall - central spike with only one peak and smaller spikes on either site
pressing on the globe too hard with the probe
are based on the same general equation

42. Laser interferometry uses which type of laser light?
dacryocystitis
infrared
to have little or no shadow
A Schirmer's test of 10 mm or more is considered normal.

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 cobalt blue filter
20
3.0 D
'test eye'

44. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
varies according to the type of test
patient wearing spectacles
20
remove the instrument from use

45. Schirmer's test I is used to measure...
desired postoperative refraction
reflex tears
are based on the same general equation
both eyes equally

46. A rose bengal does not require the use of...
the cobalt blue filter
pressing on the globe too hard with the probe
can often be cured if the causative factor is eliminated
white to white corneal diameter

47. The photosensitive pigments of the eye are sensitive to...
normal tearing
23 to 24 mm
5 minutes
red - green - and blue

48. When performing the TBUT test - the observer is looking for...
red-green
23 to 24 mm
rods
the appearance of dry spots

49. Measuring corneal thickness via nonoptical pachymetry involves the use of...
red - green - and blue
shortened axial length due to compression
ultrasound
having them trace the number/figure

50. The type of pachymetry used to evaluate a glaucoma suspect is...
central corneal thickness
red-green
suspected acquired color defect
for screening purposes - such as job applications