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...
severe dry eye
red-green
are based on the same general equation
patient wearing spectacles

2. When positioning the IOLMaster for the axial length reading...
focus can he moved off-axis to obtain a clear reading
expensive equipment
a staining agent
patient wearing spectacles

3. Illumination for the color plates test...
varies according to the type of test administered
decrease in vision due to glare conditions
a narrow angle and bowed iris cast a shadow on the iris
remove the instrument from use

4. Rose bengal is...
to have little or no shadow
a staining agent
A Schirmer's test of 10 mm or more is considered normal.
severe dry eye

5. A patient with which of the following potential diagnoses would be tested with bengal?
23 to 24 mm
severe dry eye
posterior subcapsular cataract
a narrow angle and bowed iris cast a shadow on the iris

6. 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?
IOL power
0.3 mm
the cobalt blue filter
a narrow angle and bowed iris cast a shadow on the iris

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

8. Young children can be tested using the color plates by...
infrared
5 minutes
having them trace the number/figure
both eyes equally

9. 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)...
can often be cured if the causative factor is eliminated
A-constant
is acceptable
2.0 or more

10. The ideal IOLMaster axial length graph is...
normal tearing
a tall - central spike with only one peak and smaller spikes on either site
expensive equipment
having them trace the number/figure

11. The IOLMaster eliminates which of the following sources of error?
shortened axial length due to compression
545 pm
before starting school
a tall - central spike with only one peak and smaller spikes on either site

12. Color vision testing is used to detect all of the following except...
the patient should be tested with near correction - if worn
differentiate between congenital or acquired color blindness
narrow beam
that the sound beam is directed to the optic disc and the measurement is incorrect

13. Schirmer's test II is used to measure...
to have little or no shadow
shortened axial length due to compression
normal tearing
before starting school

14. Almost all of the formulas for calculating IOL power...
varies according to the type of test administered
are based on the same general equation
3.0 D
expensive equipment

15. Which eye structure is responsible for color vision?
corneal endothelial drop-out
5 minutes
to have little or no shadow
rods

16. Hereditary color vision defects usually affect...
both eyes equally
remove the instrument from use
the patient should be tested with near correction - if worn
IOL power

17. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
refractive error
dacryocystitis
patients who have had corneal refractive surgery
are based on the same general equation

18. One of the keys in accurate pachymetry is...
holding the probe perpendicular to the corneal surface
blink
IOL power
3.0 D

19. Acquired color vision defects...
holding the probe perpendicular to the corneal surface
normal tearing
for screening purposes - such as job applications
can often be cured if the causative factor is eliminated

20. This is not evaluated using rose Bengal except...
normal tearing
Allow the patient to adjust to the light level before reading the letters.
both eyes equally
corneal endothelial drop-out

21. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
before starting school
with the central cornea
can often be cured if the causative factor is eliminated
is acceptable

22. Measuring time for the Schirmer's test is...
expensive equipment
focus can he moved off-axis to obtain a clear reading
Allow the patient to adjust to the light level before reading the letters.
5 minutes

23. If a biometry instrument fails to calibrate properly - one should...
a malingerer may invent a number - thus identifying him- or herself
ultrasound
remove the instrument from use
red-green

24. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
a malingerer may invent a number - thus identifying him- or herself
is acceptable
posterior subcapsular cataract
3.0 D

25. When calculating intraocular lens (IOL) powers - one must enter...
'test eye'
corneal endothelial drop-out
holding the probe perpendicular to the corneal surface
desired postoperative refraction

26. Estimating the anterior chamber depth with a penlight works because...
a narrow angle and bowed iris cast a shadow on the iris
the cobalt blue filter
varies according to the type of test
focus can he moved off-axis to obtain a clear reading

27. When performing pachymetry prior to refractive surgery - it is generally best to begin...
reflex tears
with the central cornea
the cobalt blue filter
varies according to the type of test

28. The difference between Schirmer's test I and II is...
the use of an anesthetic
the patient is shown a sample that is discernable to normal and abnormal alike
patient wearing spectacles
severe dry eye

29. In test a patient with the color pseudoisochromatic plates...
the defect tends to remain stable over time
central corneal thickness
the patient should be tested with near correction - if worn
red - green - and blue

30. When should a child have his or her color vision checked?
before starting school
reflex tears
20
pressing on the globe too hard with the probe

31. When using color plates - a score indicates abnormal color vision...
before starting school
to the left of the scleral and orbital echoes
varies according to the type of test
infrared

32. Measuring corneal thickness via nonoptical pachymetry involves the use of...
ultrasound
white to white corneal diameter
corneal endothelial drop-out
more males than females

33. 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
are based on the same general equation
patients who have had corneal refractive surgery
Allow the patient to adjust to the light level before reading the letters.

34. When calculating IOL power - each of the following are necessary except...
pressing on the globe too hard with the probe
5 minutes
white to white corneal diameter
the appearance of dry spots

35. In which of the following would glare testing be most appropriate?
before starting school
posterior subcapsular cataract
refractive error
'test eye'

36. Laser interferometry uses which type of laser light?
one-fourth
rods
red - green - and blue
infrared

37. Color vision defects in children are frequently detected among those with...
that the sound beam is directed to the optic disc and the measurement is incorrect
shine the light flatly from the side - in the plane of the iris
reading disabilities
narrow beam

38. An A-Sean can he artificially shortened due to...
dacryocystitis
pressing on the globe too hard with the probe
a malingerer may invent a number - thus identifying him- or herself
ultrasound

39. Pachymetry readings are routinely taken prior to...
refractive surgery
before starting school
2 to 3 seconds
white to white corneal diameter

40. The IOLMaster evaluates each of the following except...
varies according to the type of test administered
refractive error
shine the light flatly from the side - in the plane of the iris
more males than females

41. In evaluating an axial length scan - the retinal echo must be...
to the left of the scleral and orbital echoes
20
2.0 or more
the patient is shown a sample that is discernable to normal and abnormal alike

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

43. Just prior to the beginning of the TBUT test - the patient is instructed to...
a tall - central spike with only one peak and smaller spikes on either site
blink
23 to 24 mm
holding the probe perpendicular to the corneal surface

44. Glare testing is used to identify...
A-constant
shortened axial length due to compression
decrease in vision due to glare conditions
focus can he moved off-axis to obtain a clear reading

45. The Schirmer's test might be indicated in all of the following except...
dacryocystitis
Allow the patient to adjust to the light level before reading the letters.
refractive surgery
shine the light flatly from the side - in the plane of the iris

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

47. The axial length of an average adult eye is...
pressing on the globe too hard with the probe
23 to 24 mm
the cobalt blue filter
varies according to the type of test

48. How long should the patient be given to recognize the figure in a color plate?
20
10 seconds
ultrasound
2 to 3 seconds

49. Hereditary color vision defects affect...
the use of an anesthetic
more males than females
expensive equipment
one-fourth

50. 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?
one-fourth
2 to 3 seconds
refractive surgery
545 pm