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. A patient with which of the following potential diagnoses would be tested with bengal?
having them trace the number/figure
white to white corneal diameter
tear filter papers
severe dry eye

2. If a biometry instrument fails to calibrate properly - one should...
varies according to the type of test
can often be cured if the causative factor is eliminated
remove the instrument from use
the appearance of dry spots

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

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4. Color vision testing is used to detect all of the following except...
545 pm
2 to 3 seconds
differentiate between congenital or acquired color blindness
remove the instrument from use

5. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
2 to 3 seconds
reading disabilities
varies according to the type of test administered
3.0 D

6. With the 1OLMaster - the ideal signal-to-noise ratio is...
Allow the patient to adjust to the light level before reading the letters.
varies according to the type of test
2.0 or more
that the sound beam is directed to the optic disc and the measurement is incorrect

7. The average central thickness of the human cornea is...
to have little or no shadow
545 pm
dacryocystitis
is acceptable

8. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
20
holding the probe perpendicular to the corneal surface
5 minutes
the defect tends to remain stable over time

9. The type of pachymetry used to evaluate a glaucoma suspect is...
central corneal thickness
varies according to the type of test
severe dry eye
that the sound beam is directed to the optic disc and the measurement is incorrect

10. _______ are not used in evaluating tear break-up time (TBUT)
focus can he moved off-axis to obtain a clear reading
narrow beam
both eyes equally
tear filter papers

11. In evaluating an axial length scan - the retinal echo must be...
2 to 3 seconds
to the left of the scleral and orbital echoes
corneal endothelial drop-out
is acceptable

12. When calculating intraocular lens (IOL) powers - one must enter...
ultrasound
desired postoperative refraction
tear filter papers
severe dry eye

13. In which of the following would glare testing be most appropriate?
differentiate between congenital or acquired color blindness
is acceptable
more males than females
posterior subcapsular cataract

14. 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?
with the central cornea
ultrasound
desired postoperative refraction
one-fourth

15. Before proceeding with the actual color plate test...
the patient is shown a sample that is discernable to normal and abnormal alike
with the central cornea
severe dry eye
the appearance of dry spots

16. Schirmer's test I is used to measure...
reflex tears
the cobalt blue filter
severe dry eye
varies according to the type of test

17. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
A Schirmer's test of 10 mm or more is considered normal.
0.3 mm
patients who have had corneal refractive surgery
patient wearing spectacles

18. This is not evaluated using rose Bengal except...
can often be cured if the causative factor is eliminated
corneal endothelial drop-out
blink
2.0 or more

19. The ideal IOLMaster axial length graph is...
focus can he moved off-axis to obtain a clear reading
reflex tears
a tall - central spike with only one peak and smaller spikes on either site
white to white corneal diameter

20. The axial length of the eye is important in the calculation of...
patients who have had corneal refractive surgery
a narrow angle and bowed iris cast a shadow on the iris
for screening purposes - such as job applications
IOL power

21. One of the keys in accurate pachymetry is...
holding the probe perpendicular to the corneal surface
differentiate between congenital or acquired color blindness
remove the instrument from use
23 to 24 mm

22. The IOLMaster eliminates which of the following sources of error?
narrow angles may precipitate an angle-closure glaucoma attack
shortened axial length due to compression
the appearance of dry spots
patients who have had corneal refractive surgery

23. Measuring corneal thickness via nonoptical pachymetry involves the use of...
shine the light flatly from the side - in the plane of the iris
before starting school
ultrasound
the defect tends to remain stable over time

24. When performing pachymetry prior to refractive surgery - it is generally best to begin...
with the central cornea
narrow angles may precipitate an angle-closure glaucoma attack
corneal endothelial drop-out
Allow the patient to adjust to the light level before reading the letters.

25. Young children can be tested using the color plates by...
more males than females
patients who have had corneal refractive surgery
reflex tears
having them trace the number/figure

26. Almost all of the formulas for calculating IOL power...
a malingerer may invent a number - thus identifying him- or herself
'test eye'
a staining agent
are based on the same general equation

27. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
a narrow angle and bowed iris cast a shadow on the iris
infrared
patients who have had corneal refractive surgery
remove the instrument from use

28. Which of the following should be color-vision tested one eye at a time?
suspected acquired color defect
A-constant
expensive equipment
the patient is shown a sample that is discernable to normal and abnormal alike

29. 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...
posterior subcapsular cataract
varies according to the type of test
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

30. Estimating the anterior chamber depth with a penlight works because...
corneal endothelial drop-out
10 seconds
refractive error
a narrow angle and bowed iris cast a shadow on the iris

31. Schirmer's test does not require _____ except Test strips
expensive equipment
posterior subcapsular cataract
Allow the patient to adjust to the light level before reading the letters.
the patient is shown a sample that is discernable to normal and abnormal alike

32. 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
remove the instrument from use
2 to 3 seconds
20

33. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
varies according to the type of test administered
the defect tends to remain stable over time
central corneal thickness
narrow beam

34. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
decrease in vision due to glare conditions
the appearance of dry spots
is acceptable
narrow beam

35. When positioning the IOLMaster for the axial length reading...
a staining agent
shortened axial length due to compression
expensive equipment
focus can he moved off-axis to obtain a clear reading

36. Just prior to the beginning of the TBUT test - the patient is instructed to...
having them trace the number/figure
blink
a staining agent
before starting school

37. The axial length of an average adult eye is...
23 to 24 mm
patients who have had corneal refractive surgery
one-fourth
to have little or no shadow

38. When should a child have his or her color vision checked?
before starting school
blink
white to white corneal diameter
suspected acquired color defect

39. An A-Sean can he artificially shortened due to...
narrow angles may precipitate an angle-closure glaucoma attack
A Schirmer's test of 10 mm or more is considered normal.
pressing on the globe too hard with the probe
remove the instrument from use

40. Which eye structure is responsible for color vision?
corneal endothelial drop-out
3.0 D
more males than females
rods

41. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
20
2.0 or more
before starting school
remove the instrument from use

42. When using a penlight to estimate anterior chamber depth - an open angle would appear...
corneal endothelial drop-out
to have little or no shadow
reading disabilities
are based on the same general equation

43. When calculating IOL power - each of the following are necessary except...
545 pm
white to white corneal diameter
dacryocystitis
ultrasound

44. Glare testing is used to identify...
decrease in vision due to glare conditions
2 to 3 seconds
A-constant
545 pm

45. The IOLMaster evaluates each of the following except...
Allow the patient to adjust to the light level before reading the letters.
A Schirmer's test of 10 mm or more is considered normal.
more males than females
refractive error

46. When performing the TBUT test - the observer is looking for...
the appearance of dry spots
before starting school
narrow angles may precipitate an angle-closure glaucoma attack
infrared

47. Illumination for the color plates test...
narrow angles may precipitate an angle-closure glaucoma attack
Allow the patient to adjust to the light level before reading the letters.
the patient should be tested with near correction - if worn
varies according to the type of test administered

48. Pachymetry readings are routinely taken prior to...
holding the probe perpendicular to the corneal surface
the defect tends to remain stable over time
refractive surgery
varies according to the type of test

49. Schirmer's test II is used to measure...
shine the light flatly from the side - in the plane of the iris
shortened axial length due to compression
normal tearing
IOL power

50. A rose bengal does not require the use of...
the use of an anesthetic
the cobalt blue filter
the patient should be tested with near correction - if worn
Allow the patient to adjust to the light level before reading the letters.