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. Glare testing is used to identify...
decrease in vision due to glare conditions
to the left of the scleral and orbital echoes
central corneal thickness
a tall - central spike with only one peak and smaller spikes on either site

2. When positioning the IOLMaster for the axial length reading...
3.0 D
ultrasound
2.0 or more
focus can he moved off-axis to obtain a clear reading

3. The ideal IOLMaster axial length graph is...
a tall - central spike with only one peak and smaller spikes on either site
IOL power
one-fourth
to the left of the scleral and orbital echoes

4. One of the keys in accurate pachymetry is...
10 seconds
before starting school
reading disabilities
holding the probe perpendicular to the corneal surface

5. Hereditary color vision defects affect...
corneal endothelial drop-out
more males than females
severe dry eye
reflex tears

6. It is important to estimate the anterior chamber depth prior to dilation because...
the defect tends to remain stable over time
central corneal thickness
refractive error
narrow angles may precipitate an angle-closure glaucoma attack

7. A color plate that shows no obvious number to normal and abnormal alike is useful because...
the defect tends to remain stable over time
narrow beam
a staining agent
a malingerer may invent a number - thus identifying him- or herself

8. Which of the following should be color-vision tested one eye at a time?
suspected acquired color defect
central corneal thickness
dacryocystitis
5 minutes

9. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
both eyes equally
reflex tears
patients who have had corneal refractive surgery
the appearance of dry spots

10. When using color plates - a score indicates abnormal color vision...
A Schirmer's test of 10 mm or more is considered normal.
A-constant
545 pm
varies according to the type of test

11. 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
before starting school
IOL power
red-green

12. A rose bengal does not require the use of...
the defect tends to remain stable over time
the cobalt blue filter
desired postoperative refraction
shine the light flatly from the side - in the plane of the iris

13. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
the defect tends to remain stable over time
shortened axial length due to compression
3.0 D
patients who have had corneal refractive surgery

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

15. Laser interferometry uses which type of laser light?
the cobalt blue filter
infrared
focus can he moved off-axis to obtain a clear reading
ultrasound

16. Color vision testing is used to detect all of the following except...
differentiate between congenital or acquired color blindness
focus can he moved off-axis to obtain a clear reading
10 seconds
holding the probe perpendicular to the corneal surface

17. The Ishihara color plates are useful...
for screening purposes - such as job applications
normal tearing
patient wearing spectacles
the use of an anesthetic

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

19. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
red-green
to the left of the scleral and orbital echoes
is acceptable
a narrow angle and bowed iris cast a shadow on the iris

20. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
with the central cornea
10 seconds
2 to 3 seconds
narrow beam

21. 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?
holding the probe perpendicular to the corneal surface
one-fourth
varies according to the type of test
10 seconds

22. The Schirmer's test might be indicated in all of the following except...
varies according to the type of test administered
a tall - central spike with only one peak and smaller spikes on either site
both eyes equally
dacryocystitis

23. With the 1OLMaster - the ideal signal-to-noise ratio is...
both eyes equally
is acceptable
2.0 or more
reading disabilities

24. Schirmer's test II is used to measure...
decrease in vision due to glare conditions
normal tearing
reading disabilities
reflex tears

25. Estimating the anterior chamber depth with a penlight works because...
a staining agent
a narrow angle and bowed iris cast a shadow on the iris
holding the probe perpendicular to the corneal surface
A Schirmer's test of 10 mm or more is considered normal.

26. 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?
blink
reading disabilities
0.3 mm
one-fourth

27. Color vision defects in children are frequently detected among those with...
'test eye'
reading disabilities
are based on the same general equation
shortened axial length due to compression

28. The axial length of the eye is important in the calculation of...
dacryocystitis
IOL power
remove the instrument from use
the use of an anesthetic

29. Just prior to the beginning of the TBUT test - the patient is instructed to...
blink
central corneal thickness
the cobalt blue filter
10 seconds

30. Pachymetry readings are routinely taken prior to...
the defect tends to remain stable over time
refractive surgery
white to white corneal diameter
varies according to the type of test

31. _______ are not used in evaluating tear break-up time (TBUT)
tear filter papers
for screening purposes - such as job applications
focus can he moved off-axis to obtain a clear reading
suspected acquired color defect

32. The average central thickness of the human cornea is...
narrow angles may precipitate an angle-closure glaucoma attack
reading disabilities
545 pm
with the central cornea

33. When performing a brightness acuity glare test - it is best to do which of the following?
remove the instrument from use
focus can he moved off-axis to obtain a clear reading
Allow the patient to adjust to the light level before reading the letters.
dacryocystitis

34. An A-Sean can he artificially shortened due to...
pressing on the globe too hard with the probe
10 seconds
the use of an anesthetic
posterior subcapsular cataract

35. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
ultrasound
can often be cured if the causative factor is eliminated
varies according to the type of test administered
the defect tends to remain stable over time

36. In which of the following would glare testing be most appropriate?
posterior subcapsular cataract
reading disabilities
3.0 D
refractive surgery

37. The IOLMaster eliminates which of the following sources of error?
remove the instrument from use
infrared
corneal endothelial drop-out
shortened axial length due to compression

38. In test a patient with the color pseudoisochromatic plates...
pressing on the globe too hard with the probe
the patient should be tested with near correction - if worn
a tall - central spike with only one peak and smaller spikes on either site
can often be cured if the causative factor is eliminated

39. The IOLMaster evaluates each of the following except...
the patient is shown a sample that is discernable to normal and abnormal alike
infrared
rods
refractive error

40. Acquired color vision defects...
reflex tears
to the left of the scleral and orbital echoes
can often be cured if the causative factor is eliminated
A Schirmer's test of 10 mm or more is considered normal.

41. Young children can be tested using the color plates by...
having them trace the number/figure
23 to 24 mm
the cobalt blue filter
tear filter papers

42. How long should the patient be given to recognize the figure in a color plate?
2 to 3 seconds
holding the probe perpendicular to the corneal surface
infrared
dacryocystitis

43. If a biometry instrument fails to calibrate properly - one should...
remove the instrument from use
having them trace the number/figure
one-fourth
with the central cornea

44. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
patient wearing spectacles
are based on the same general equation
patients who have had corneal refractive surgery
posterior subcapsular cataract

45. Measuring corneal thickness via nonoptical pachymetry involves the use of...
holding the probe perpendicular to the corneal surface
2 to 3 seconds
the cobalt blue filter
ultrasound

46. Schirmer's test does not require _____ except Test strips
corneal endothelial drop-out
expensive equipment
pressing on the globe too hard with the probe
reflex tears

47. A TBUT of which of the following would indicate tear film dysfunction?
differentiate between congenital or acquired color blindness
10 seconds
patient wearing spectacles
A-constant

48. When calculating IOL power - each of the following are necessary except...
the use of an anesthetic
white to white corneal diameter
reflex tears
both eyes equally

49. Schirmer's test I is used to measure...
the use of an anesthetic
infrared
Allow the patient to adjust to the light level before reading the letters.
reflex tears

50. This is not evaluated using rose Bengal except...
corneal endothelial drop-out
a malingerer may invent a number - thus identifying him- or herself
patient wearing spectacles
red-green