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. The IOLMaster eliminates which of the following sources of error?
shortened axial length due to compression
A Schirmer's test of 10 mm or more is considered normal.
blink
the patient is shown a sample that is discernable to normal and abnormal alike

2. Glare testing is used to identify...
both eyes equally
decrease in vision due to glare conditions
suspected acquired color defect
with the central cornea

3. Color vision defects in children are frequently detected among those with...
2 to 3 seconds
patients who have had corneal refractive surgery
holding the probe perpendicular to the corneal surface
reading disabilities

4. Illumination for the color plates test...
the appearance of dry spots
refractive surgery
blink
varies according to the type of test administered

5. The ideal IOLMaster axial length graph is...
a tall - central spike with only one peak and smaller spikes on either site
23 to 24 mm
white to white corneal diameter
a malingerer may invent a number - thus identifying him- or herself

6. The axial length of the eye is important in the calculation of...
are based on the same general equation
suspected acquired color defect
IOL power
narrow beam

7. In evaluating an axial length scan - the retinal echo must be...
20
holding the probe perpendicular to the corneal surface
to the left of the scleral and orbital echoes
2.0 or more

8. 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?
having them trace the number/figure
differentiate between congenital or acquired color blindness
corneal endothelial drop-out
one-fourth

9. This is not evaluated using rose Bengal except...
corneal endothelial drop-out
2 to 3 seconds
desired postoperative refraction
narrow angles may precipitate an angle-closure glaucoma attack

10. 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?
0.3 mm
ultrasound
a malingerer may invent a number - thus identifying him- or herself
is acceptable

11. When positioning the IOLMaster for the axial length reading...
the patient is shown a sample that is discernable to normal and abnormal alike
focus can he moved off-axis to obtain a clear reading
a staining agent
corneal endothelial drop-out

12. Rose bengal is...
2 to 3 seconds
red-green
a staining agent
A-constant

13. Schirmer's test II is used to measure...
both eyes equally
normal tearing
to have little or no shadow
differentiate between congenital or acquired color blindness

14. Almost all of the formulas for calculating IOL power...
the defect tends to remain stable over time
A-constant
are based on the same general equation
narrow angles may precipitate an angle-closure glaucoma attack

15. 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...
severe dry eye
for screening purposes - such as job applications
that the sound beam is directed to the optic disc and the measurement is incorrect
white to white corneal diameter

16. When performing a brightness acuity glare test - it is best to do which of the following?
varies according to the type of test administered
Allow the patient to adjust to the light level before reading the letters.
the defect tends to remain stable over time
IOL power

17. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
a narrow angle and bowed iris cast a shadow on the iris
shine the light flatly from the side - in the plane of the iris
Allow the patient to adjust to the light level before reading the letters.
the patient should be tested with near correction - if worn

18. The type of pachymetry used to evaluate a glaucoma suspect is...
rods
23 to 24 mm
a staining agent
central corneal thickness

19. When using a penlight to estimate anterior chamber depth - an open angle would appear...
both eyes equally
is acceptable
for screening purposes - such as job applications
to have little or no shadow

20. Just prior to the beginning of the TBUT test - the patient is instructed to...
shine the light flatly from the side - in the plane of the iris
blink
red-green
reflex tears

21. A TBUT of which of the following would indicate tear film dysfunction?
the appearance of dry spots
10 seconds
a narrow angle and bowed iris cast a shadow on the iris
holding the probe perpendicular to the corneal surface

22. Hereditary color defects most often fall into which category?
dacryocystitis
is acceptable
reading disabilities
red-green

23. When calculating IOL power - each of the following are necessary except...
infrared
are based on the same general equation
refractive surgery
white to white corneal diameter

24. Color vision testing is used to detect all of the following except...
rods
differentiate between congenital or acquired color blindness
shine the light flatly from the side - in the plane of the iris
a staining agent

25. When calculating intraocular lens (IOL) powers - one must enter...
desired postoperative refraction
decrease in vision due to glare conditions
tear filter papers
more males than females

26. An A-Sean can he artificially shortened due to...
refractive surgery
pressing on the globe too hard with the probe
rods
red - green - and blue

27. Measuring time for the Schirmer's test is...
5 minutes
varies according to the type of test
with the central cornea
central corneal thickness

28. When performing the TBUT test - the observer is looking for...
the appearance of dry spots
expensive equipment
narrow beam
reading disabilities

29. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
a staining agent
can often be cured if the causative factor is eliminated
expensive equipment
narrow beam

30. In test a patient with the color pseudoisochromatic plates...
remove the instrument from use
the patient should be tested with near correction - if worn
narrow beam
reflex tears

31. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
narrow angles may precipitate an angle-closure glaucoma attack
white to white corneal diameter
focus can he moved off-axis to obtain a clear reading
patients who have had corneal refractive surgery

32. Pachymetry readings are routinely taken prior to...
shortened axial length due to compression
refractive surgery
expensive equipment
IOL power

33. The axial length of an average adult eye is...
blink
shortened axial length due to compression
20
23 to 24 mm

34. In which of the following would glare testing be most appropriate?
the appearance of dry spots
0.3 mm
the cobalt blue filter
posterior subcapsular cataract

35. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
is acceptable
that the sound beam is directed to the optic disc and the measurement is incorrect
20
the cobalt blue filter

36. Schirmer's test I is used to measure...
a narrow angle and bowed iris cast a shadow on the iris
pressing on the globe too hard with the probe
reflex tears
decrease in vision due to glare conditions

37. Estimating the anterior chamber depth with a penlight works because...
red - green - and blue
expensive equipment
one-fourth
a narrow angle and bowed iris cast a shadow on the iris

38. When performing pachymetry prior to refractive surgery - it is generally best to begin...
normal tearing
a malingerer may invent a number - thus identifying him- or herself
a staining agent
with the central cornea

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

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

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41. One of the keys in accurate pachymetry is...
desired postoperative refraction
varies according to the type of test administered
holding the probe perpendicular to the corneal surface
red - green - and blue

42. Schirmer's test does not require _____ except Test strips
that the sound beam is directed to the optic disc and the measurement is incorrect
the use of an anesthetic
patients who have had corneal refractive surgery
expensive equipment

43. 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)...
corneal endothelial drop-out
2 to 3 seconds
A-constant
desired postoperative refraction

44. Young children can be tested using the color plates by...
varies according to the type of test administered
having them trace the number/figure
a staining agent
red - green - and blue

45. The IOLMaster evaluates each of the following except...
shortened axial length due to compression
for screening purposes - such as job applications
refractive error
20

46. The average central thickness of the human cornea is...
10 seconds
'test eye'
545 pm
to have little or no shadow

47. Laser interferometry uses which type of laser light?
2.0 or more
that the sound beam is directed to the optic disc and the measurement is incorrect
infrared
white to white corneal diameter

48. Which eye structure is responsible for color vision?
to have little or no shadow
rods
Allow the patient to adjust to the light level before reading the letters.
patient wearing spectacles

49. The photosensitive pigments of the eye are sensitive to...
red - green - and blue
with the central cornea
both eyes equally
are based on the same general equation

50. If a biometry instrument fails to calibrate properly - one should...
for screening purposes - such as job applications
narrow beam
remove the instrument from use
to the left of the scleral and orbital echoes