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. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
more males than females
narrow beam
the appearance of dry spots
dacryocystitis

2. The photosensitive pigments of the eye are sensitive to...
red - green - and blue
corneal endothelial drop-out
shine the light flatly from the side - in the plane of the iris
IOL power

3. A patient with which of the following potential diagnoses would be tested with bengal?
severe dry eye
the cobalt blue filter
the use of an anesthetic
the patient is shown a sample that is discernable to normal and abnormal alike

4. When performing the TBUT test - the observer is looking for...
before starting school
refractive surgery
the appearance of dry spots
holding the probe perpendicular to the corneal surface

5. In evaluating an axial length scan - the retinal echo must be...
are based on the same general equation
to the left of the scleral and orbital echoes
differentiate between congenital or acquired color blindness
red - green - and blue

6. Hereditary color defects most often fall into which category?
the appearance of dry spots
red-green
patients who have had corneal refractive surgery
focus can he moved off-axis to obtain a clear reading

7. 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)...
that the sound beam is directed to the optic disc and the measurement is incorrect
focus can he moved off-axis to obtain a clear reading
a staining agent
A-constant

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

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9. Estimating the anterior chamber depth with a penlight works because...
refractive error
for screening purposes - such as job applications
a narrow angle and bowed iris cast a shadow on the iris
can often be cured if the causative factor is eliminated

10. Hereditary color vision defects affect...
corneal endothelial drop-out
'test eye'
more males than females
reading disabilities

11. Acquired color vision defects...
reflex tears
red - green - and blue
can often be cured if the causative factor is eliminated
0.3 mm

12. Pachymetry readings are routinely taken prior to...
refractive surgery
expensive equipment
desired postoperative refraction
red - green - and blue

13. Which eye structure is responsible for color vision?
rods
IOL power
is acceptable
white to white corneal diameter

14. 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
2 to 3 seconds
rods
5 minutes

15. Laser interferometry uses which type of laser light?
shine the light flatly from the side - in the plane of the iris
red - green - and blue
infrared
reflex tears

16. The axial length of an average adult eye is...
to have little or no shadow
23 to 24 mm
a malingerer may invent a number - thus identifying him- or herself
for screening purposes - such as job applications

17. 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
IOL power
one-fourth
is acceptable

18. When calculating IOL power - each of the following are necessary except...
patient wearing spectacles
posterior subcapsular cataract
3.0 D
white to white corneal diameter

19. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
the cobalt blue filter
having them trace the number/figure
2.0 or more
patient wearing spectacles

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?
reading disabilities
Allow the patient to adjust to the light level before reading the letters.
holding the probe perpendicular to the corneal surface
0.3 mm

21. Schirmer's test I is used to measure...
red - green - and blue
reflex tears
refractive surgery
pressing on the globe too hard with the probe

22. Schirmer's test II is used to measure...
normal tearing
posterior subcapsular cataract
5 minutes
with the central cornea

23. _______ are not used in evaluating tear break-up time (TBUT)
tear filter papers
narrow angles may precipitate an angle-closure glaucoma attack
A Schirmer's test of 10 mm or more is considered normal.
for screening purposes - such as job applications

24. When performing a brightness acuity glare test - it is best to do which of the following?
for screening purposes - such as job applications
Allow the patient to adjust to the light level before reading the letters.
pressing on the globe too hard with the probe
5 minutes

25. Hereditary color vision defects usually affect...
desired postoperative refraction
both eyes equally
2 to 3 seconds
'test eye'

26. It is important to estimate the anterior chamber depth prior to dilation because...
narrow angles may precipitate an angle-closure glaucoma attack
shine the light flatly from the side - in the plane of the iris
tear filter papers
holding the probe perpendicular to the corneal surface

27. The Ishihara color plates are useful...
for screening purposes - such as job applications
corneal endothelial drop-out
a malingerer may invent a number - thus identifying him- or herself
both eyes equally

28. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
is acceptable
20
remove the instrument from use
can often be cured if the causative factor is eliminated

29. An A-Sean can he artificially shortened due to...
red - green - and blue
reflex tears
3.0 D
pressing on the globe too hard with the probe

30. Color vision defects in children are frequently detected among those with...
the use of an anesthetic
reading disabilities
expensive equipment
patient wearing spectacles

31. With the 1OLMaster - the ideal signal-to-noise ratio is...
red-green
the patient should be tested with near correction - if worn
a staining agent
2.0 or more

32. When performing pachymetry prior to refractive surgery - it is generally best to begin...
expensive equipment
infrared
with the central cornea
reading disabilities

33. A color plate that shows no obvious number to normal and abnormal alike is useful because...
more males than females
a malingerer may invent a number - thus identifying him- or herself
suspected acquired color defect
to the left of the scleral and orbital echoes

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

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35. The ideal IOLMaster axial length graph is...
a tall - central spike with only one peak and smaller spikes on either site
reflex tears
tear filter papers
to have little or no shadow

36. The type of pachymetry used to evaluate a glaucoma suspect is...
blink
Allow the patient to adjust to the light level before reading the letters.
narrow angles may precipitate an angle-closure glaucoma attack
central corneal thickness

37. When using color plates - a score indicates abnormal color vision...
red-green
varies according to the type of test
A-constant
are based on the same general equation

38. A TBUT of which of the following would indicate tear film dysfunction?
shortened axial length due to compression
10 seconds
having them trace the number/figure
to have little or no shadow

39. Measuring time for the Schirmer's test is...
remove the instrument from use
the patient should be tested with near correction - if worn
5 minutes
refractive error

40. The IOLMaster evaluates each of the following except...
refractive error
red - green - and blue
to have little or no shadow
A-constant

41. 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
varies according to the type of test
dacryocystitis
rods

42. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
a malingerer may invent a number - thus identifying him- or herself
blink
pressing on the globe too hard with the probe
patients who have had corneal refractive surgery

43. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
corneal endothelial drop-out
20
central corneal thickness
more males than females

44. In test a patient with the color pseudoisochromatic plates...
normal tearing
the patient should be tested with near correction - if worn
remove the instrument from use
the patient is shown a sample that is discernable to normal and abnormal alike

45. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
0.3 mm
focus can he moved off-axis to obtain a clear reading
3.0 D
reading disabilities

46. Schirmer's test does not require _____ except Test strips
545 pm
0.3 mm
expensive equipment
refractive error

47. Measuring corneal thickness via nonoptical pachymetry involves the use of...
to have little or no shadow
red-green
varies according to the type of test administered
ultrasound

48. The Schirmer's test might be indicated in all of the following except...
the defect tends to remain stable over time
are based on the same general equation
dacryocystitis
differentiate between congenital or acquired color blindness

49. The difference between Schirmer's test I and II is...
the use of an anesthetic
3.0 D
narrow beam
blink

50. This is not evaluated using rose Bengal except...
decrease in vision due to glare conditions
corneal endothelial drop-out
having them trace the number/figure
holding the probe perpendicular to the corneal surface