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. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
more males than females
rods
patient wearing spectacles
focus can he moved off-axis to obtain a clear reading

2. The difference between Schirmer's test I and II is...
focus can he moved off-axis to obtain a clear reading
the use of an anesthetic
tear filter papers
5 minutes

3. 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
remove the instrument from use
a tall - central spike with only one peak and smaller spikes on either site
one-fourth

4. Almost all of the formulas for calculating IOL power...
the patient is shown a sample that is discernable to normal and abnormal alike
are based on the same general equation
varies according to the type of test administered
20

5. A TBUT of which of the following would indicate tear film dysfunction?
narrow beam
A Schirmer's test of 10 mm or more is considered normal.
infrared
10 seconds

6. A rose bengal does not require the use of...
focus can he moved off-axis to obtain a clear reading
the cobalt blue filter
are based on the same general equation
reading disabilities

7. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
narrow beam
shine the light flatly from the side - in the plane of the iris
having them trace the number/figure
dacryocystitis

8. Rose bengal is...
is acceptable
Allow the patient to adjust to the light level before reading the letters.
to the left of the scleral and orbital echoes
a staining agent

9. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
2 to 3 seconds
patients who have had corneal refractive surgery
refractive surgery
a staining agent

10. When performing the TBUT test - the observer is looking for...
2.0 or more
expensive equipment
20
the appearance of dry spots

11. Measuring corneal thickness via nonoptical pachymetry involves the use of...
tear filter papers
ultrasound
holding the probe perpendicular to the corneal surface
the defect tends to remain stable over time

12. Illumination for the color plates test...
varies according to the type of test administered
blink
reflex tears
to the left of the scleral and orbital echoes

13. Color vision defects in children are frequently detected among those with...
before starting school
reading disabilities
that the sound beam is directed to the optic disc and the measurement is incorrect
IOL power

14. Glare testing is used to identify...
pressing on the globe too hard with the probe
2.0 or more
decrease in vision due to glare conditions
normal tearing

15. When should a child have his or her color vision checked?
one-fourth
rods
before starting school
varies according to the type of test

16. Schirmer's test I is used to measure...
3.0 D
central corneal thickness
holding the probe perpendicular to the corneal surface
reflex tears

17. A patient with which of the following potential diagnoses would be tested with bengal?
severe dry eye
0.3 mm
to have little or no shadow
focus can he moved off-axis to obtain a clear reading

18. A color plate that shows no obvious number to normal and abnormal alike is useful because...
reading disabilities
a malingerer may invent a number - thus identifying him- or herself
dacryocystitis
a staining agent

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

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20. 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?
shine the light flatly from the side - in the plane of the iris
A-constant
focus can he moved off-axis to obtain a clear reading
0.3 mm

21. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
the use of an anesthetic
suspected acquired color defect
narrow beam
20

22. 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)...
having them trace the number/figure
A-constant
10 seconds
suspected acquired color defect

23. The axial length of an average adult eye is...
varies according to the type of test administered
desired postoperative refraction
differentiate between congenital or acquired color blindness
23 to 24 mm

24. In evaluating an axial length scan - the retinal echo must be...
before starting school
23 to 24 mm
to the left of the scleral and orbital echoes
varies according to the type of test administered

25. How long should the patient be given to recognize the figure in a color plate?
corneal endothelial drop-out
the patient is shown a sample that is discernable to normal and abnormal alike
23 to 24 mm
2 to 3 seconds

26. The IOLMaster eliminates which of the following sources of error?
severe dry eye
shortened axial length due to compression
corneal endothelial drop-out
is acceptable

27. The Ishihara color plates are useful...
reflex tears
for screening purposes - such as job applications
with the central cornea
5 minutes

28. _______ are not used in evaluating tear break-up time (TBUT)
patients who have had corneal refractive surgery
tear filter papers
the patient should be tested with near correction - if worn
before starting school

29. Laser interferometry uses which type of laser light?
with the central cornea
infrared
varies according to the type of test administered
more males than females

30. With the 1OLMaster - the ideal signal-to-noise ratio is...
varies according to the type of test
the patient is shown a sample that is discernable to normal and abnormal alike
2.0 or more
a malingerer may invent a number - thus identifying him- or herself

31. The Schirmer's test might be indicated in all of the following except...
rods
dacryocystitis
reading disabilities
pressing on the globe too hard with the probe

32. Which eye structure is responsible for color vision?
rods
a tall - central spike with only one peak and smaller spikes on either site
expensive equipment
shortened axial length due to compression

33. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
varies according to the type of test administered
a staining agent
is acceptable
the appearance of dry spots

34. When using a penlight to estimate anterior chamber depth - an open angle would appear...
infrared
to have little or no shadow
desired postoperative refraction
with the central cornea

35. The average central thickness of the human cornea is...
the defect tends to remain stable over time
545 pm
patient wearing spectacles
white to white corneal diameter

36. An A-Sean can he artificially shortened due to...
to have little or no shadow
varies according to the type of test
'test eye'
pressing on the globe too hard with the probe

37. Measuring time for the Schirmer's test is...
central corneal thickness
5 minutes
desired postoperative refraction
the cobalt blue filter

38. When positioning the IOLMaster for the axial length reading...
focus can he moved off-axis to obtain a clear reading
normal tearing
central corneal thickness
with the central cornea

39. When using color plates - a score indicates abnormal color vision...
more males than females
narrow angles may precipitate an angle-closure glaucoma attack
varies according to the type of test
before starting school

40. Hereditary color vision defects affect...
red-green
before starting school
more males than females
the defect tends to remain stable over time

41. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
shortened axial length due to compression
3.0 D
holding the probe perpendicular to the corneal surface
23 to 24 mm

42. In test a patient with the color pseudoisochromatic plates...
desired postoperative refraction
545 pm
a staining agent
the patient should be tested with near correction - if worn

43. Estimating the anterior chamber depth with a penlight works because...
expensive equipment
red-green
a narrow angle and bowed iris cast a shadow on the iris
0.3 mm

44. Hereditary color defects most often fall into which category?
before starting school
varies according to the type of test
red-green
is acceptable

45. The type of pachymetry used to evaluate a glaucoma suspect is...
central corneal thickness
differentiate between congenital or acquired color blindness
shortened axial length due to compression
white to white corneal diameter

46. In which of the following would glare testing be most appropriate?
infrared
posterior subcapsular cataract
severe dry eye
red-green

47. When performing a brightness acuity glare test - it is best to do which of the following?
10 seconds
Allow the patient to adjust to the light level before reading the letters.
red-green
a malingerer may invent a number - thus identifying him- or herself

48. The IOLMaster evaluates each of the following except...
red - green - and blue
focus can he moved off-axis to obtain a clear reading
5 minutes
refractive error

49. Young children can be tested using the color plates by...
5 minutes
refractive error
having them trace the number/figure
can often be cured if the causative factor is eliminated

50. Pachymetry readings are routinely taken prior to...
refractive surgery
2 to 3 seconds
focus can he moved off-axis to obtain a clear reading
posterior subcapsular cataract