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 TBUT of which of the following would indicate tear film dysfunction?
10 seconds
are based on the same general equation
shortened axial length due to compression
2 to 3 seconds

2. It is important to estimate the anterior chamber depth prior to dilation because...
tear filter papers
Allow the patient to adjust to the light level before reading the letters.
rods
narrow angles may precipitate an angle-closure glaucoma attack

3. The IOLMaster evaluates each of the following except...
refractive error
the defect tends to remain stable over time
posterior subcapsular cataract
2.0 or more

4. Color vision testing is used to detect all of the following except...
a narrow angle and bowed iris cast a shadow on the iris
differentiate between congenital or acquired color blindness
Allow the patient to adjust to the light level before reading the letters.
are based on the same general equation

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

6. When using a penlight to estimate anterior chamber depth - an open angle would appear...
A Schirmer's test of 10 mm or more is considered normal.
to have little or no shadow
'test eye'
the use of an anesthetic

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

8. Illumination for the color plates test...
refractive error
having them trace the number/figure
varies according to the type of test administered
narrow beam

9. Measuring corneal thickness via nonoptical pachymetry involves the use of...
for screening purposes - such as job applications
ultrasound
0.3 mm
patient wearing spectacles

10. Rose bengal is...
shortened axial length due to compression
holding the probe perpendicular to the corneal surface
a staining agent
a malingerer may invent a number - thus identifying him- or herself

11. The average central thickness of the human cornea is...
545 pm
refractive error
blink
posterior subcapsular cataract

12. Hereditary color defects most often fall into which category?
both eyes equally
red-green
a malingerer may invent a number - thus identifying him- or herself
refractive error

13. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
0.3 mm
one-fourth
corneal endothelial drop-out
is acceptable

14. The photosensitive pigments of the eye are sensitive to...
infrared
red - green - and blue
the appearance of dry spots
varies according to the type of test administered

15. Just prior to the beginning of the TBUT test - the patient is instructed to...
shortened axial length due to compression
Allow the patient to adjust to the light level before reading the letters.
blink
is acceptable

16. The type of pachymetry used to evaluate a glaucoma suspect is...
rods
shortened axial length due to compression
central corneal thickness
posterior subcapsular cataract

17. When should a child have his or her color vision checked?
is acceptable
before starting school
patients who have had corneal refractive surgery
23 to 24 mm

18. 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
infrared
narrow angles may precipitate an angle-closure glaucoma attack
23 to 24 mm

19. 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 staining agent
holding the probe perpendicular to the corneal surface
A-constant
for screening purposes - such as job applications

20. Acquired color vision defects...
tear filter papers
can often be cured if the causative factor is eliminated
holding the probe perpendicular to the corneal surface
the appearance of dry spots

21. Which eye structure is responsible for color vision?
red - green - and blue
a staining agent
rods
corneal endothelial drop-out

22. Laser interferometry uses which type of laser light?
red-green
the cobalt blue filter
differentiate between congenital or acquired color blindness
infrared

23. When performing the TBUT test - the observer is looking for...
reflex tears
the appearance of dry spots
white to white corneal diameter
varies according to the type of test

24. Hereditary color vision defects usually affect...
2 to 3 seconds
the patient should be tested with near correction - if worn
both eyes equally
A Schirmer's test of 10 mm or more is considered normal.

25. Hereditary color vision defects affect...
with the central cornea
a narrow angle and bowed iris cast a shadow on the iris
more males than females
ultrasound

26. Before proceeding with the actual color plate test...
5 minutes
20
with the central cornea
the patient is shown a sample that is discernable to normal and abnormal alike

27. The difference between Schirmer's test I and II is...
the use of an anesthetic
545 pm
0.3 mm
a malingerer may invent a number - thus identifying him- or herself

28. Young children can be tested using the color plates by...
545 pm
20
2.0 or more
having them trace the number/figure

29. 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
is acceptable
Allow the patient to adjust to the light level before reading the letters.
varies according to the type of test

30. Glare testing is used to identify...
shine the light flatly from the side - in the plane of the iris
'test eye'
decrease in vision due to glare conditions
reflex tears

31. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
for screening purposes - such as job applications
pressing on the globe too hard with the probe
the defect tends to remain stable over time
Allow the patient to adjust to the light level before reading the letters.

32. When performing a brightness acuity glare test - it is best to do which of the following?
Allow the patient to adjust to the light level before reading the letters.
infrared
one-fourth
for screening purposes - such as job applications

33. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
varies according to the type of test
having them trace the number/figure
before starting school
3.0 D

34. When using color plates - a score indicates abnormal color vision...
normal tearing
varies according to the type of test
suspected acquired color defect
10 seconds

35. The IOLMaster eliminates which of the following sources of error?
before starting school
shortened axial length due to compression
the use of an anesthetic
both eyes equally

36. The axial length of the eye is important in the calculation of...
varies according to the type of test administered
0.3 mm
2 to 3 seconds
IOL power

37. When calculating IOL power - each of the following are necessary except...
for screening purposes - such as job applications
varies according to the type of test administered
white to white corneal diameter
with the central cornea

38. Schirmer's test does not require _____ except Test strips
infrared
can often be cured if the causative factor is eliminated
expensive equipment
dacryocystitis

39. When positioning the IOLMaster for the axial length reading...
545 pm
focus can he moved off-axis to obtain a clear reading
rods
2 to 3 seconds

40. 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
holding the probe perpendicular to the corneal surface
expensive equipment
reflex tears

41. The ideal IOLMaster axial length graph is...
20
central corneal thickness
focus can he moved off-axis to obtain a clear reading
a tall - central spike with only one peak and smaller spikes on either site

42. Schirmer's test II is used to measure...
normal tearing
blink
0.3 mm
having them trace the number/figure

43. Pachymetry readings are routinely taken prior to...
refractive error
reflex tears
varies according to the type of test
refractive surgery

44. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
blink
patient wearing spectacles
to have little or no shadow
one-fourth

45. Almost all of the formulas for calculating IOL power...
tear filter papers
for screening purposes - such as job applications
are based on the same general equation
decrease in vision due to glare conditions

46. One of the keys in accurate pachymetry is...
for screening purposes - such as job applications
normal tearing
central corneal thickness
holding the probe perpendicular to the corneal surface

47. 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
the patient is shown a sample that is discernable to normal and abnormal alike
2.0 or more
dacryocystitis

48. 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
one-fourth
infrared
are based on the same general equation

49. A patient with which of the following potential diagnoses would be tested with bengal?
23 to 24 mm
severe dry eye
central corneal thickness
focus can he moved off-axis to obtain a clear reading

50. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
patients who have had corneal refractive surgery
rods
with the central cornea
expensive equipment