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. In which of the following would glare testing be most appropriate?
infrared
with the central cornea
varies according to the type of test administered
posterior subcapsular cataract

2. A TBUT of which of the following would indicate tear film dysfunction?
shine the light flatly from the side - in the plane of the iris
10 seconds
the use of an anesthetic
A Schirmer's test of 10 mm or more is considered normal.

3. One of the keys in accurate pachymetry is...
is acceptable
before starting school
tear filter papers
holding the probe perpendicular to the corneal surface

4. _______ are not used in evaluating tear break-up time (TBUT)
tear filter papers
Allow the patient to adjust to the light level before reading the letters.
infrared
holding the probe perpendicular to the corneal surface

5. Pachymetry readings are routinely taken prior to...
rods
shine the light flatly from the side - in the plane of the iris
0.3 mm
refractive surgery

6. Hereditary color vision defects usually affect...
the defect tends to remain stable over time
both eyes equally
dacryocystitis
10 seconds

7. The Schirmer's test might be indicated in all of the following except...
are based on the same general equation
dacryocystitis
the cobalt blue filter
10 seconds

8. How long should the patient be given to recognize the figure in a color plate?
a malingerer may invent a number - thus identifying him- or herself
2 to 3 seconds
0.3 mm
that the sound beam is directed to the optic disc and the measurement is incorrect

9. 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
tear filter papers
blink

10. This is not evaluated using rose Bengal except...
A-constant
dacryocystitis
to have little or no shadow
corneal endothelial drop-out

11. When positioning the IOLMaster for the axial length reading...
'test eye'
IOL power
focus can he moved off-axis to obtain a clear reading
white to white corneal diameter

12. When calculating intraocular lens (IOL) powers - one must enter...
varies according to the type of test administered
IOL power
white to white corneal diameter
desired postoperative refraction

13. Just prior to the beginning of the TBUT test - the patient is instructed to...
blink
23 to 24 mm
focus can he moved off-axis to obtain a clear reading
reflex tears

14. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
differentiate between congenital or acquired color blindness
tear filter papers
shine the light flatly from the side - in the plane of the iris
is acceptable

15. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
expensive equipment
20
severe dry eye
to have little or no shadow

16. When performing pachymetry prior to refractive surgery - it is generally best to begin...
holding the probe perpendicular to the corneal surface
with the central cornea
central corneal thickness
suspected acquired color defect

17. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
refractive surgery
pressing on the globe too hard with the probe
narrow beam
rods

18. 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?
refractive surgery
0.3 mm
the patient should be tested with near correction - if worn
desired postoperative refraction

19. Laser interferometry uses which type of laser light?
white to white corneal diameter
infrared
are based on the same general equation
is acceptable

20. With the 1OLMaster - the ideal signal-to-noise ratio is...
severe dry eye
are based on the same general equation
both eyes equally
2.0 or more

21. A patient with which of the following potential diagnoses would be tested with bengal?
severe dry eye
varies according to the type of test administered
patients who have had corneal refractive surgery
shortened axial length due to compression

22. The axial length of the eye is important in the calculation of...
3.0 D
the appearance of dry spots
IOL power
2.0 or more

23. A color plate that shows no obvious number to normal and abnormal alike is useful because...
white to white corneal diameter
corneal endothelial drop-out
red - green - and blue
a malingerer may invent a number - thus identifying him- or herself

24. Hereditary color defects most often fall into which category?
red-green
IOL power
focus can he moved off-axis to obtain a clear reading
remove the instrument from use

25. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
the defect tends to remain stable over time
patient wearing spectacles
narrow beam
can often be cured if the causative factor is eliminated

26. The average central thickness of the human cornea is...
decrease in vision due to glare conditions
white to white corneal diameter
545 pm
the patient is shown a sample that is discernable to normal and abnormal alike

27. The ideal IOLMaster axial length graph is...
a tall - central spike with only one peak and smaller spikes on either site
to have little or no shadow
'test eye'
with the central cornea

28. The IOLMaster evaluates each of the following except...
the defect tends to remain stable over time
10 seconds
a staining agent
refractive error

29. In evaluating an axial length scan - the retinal echo must be...
to the left of the scleral and orbital echoes
patients who have had corneal refractive surgery
having them trace the number/figure
3.0 D

30. 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.
shortened axial length due to compression
white to white corneal diameter
for screening purposes - such as job applications

31. When should a child have his or her color vision checked?
before starting school
decrease in vision due to glare conditions
2.0 or more
having them trace the number/figure

32. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
desired postoperative refraction
ultrasound
severe dry eye
3.0 D

33. Schirmer's test I is used to measure...
refractive error
reflex tears
the patient is shown a sample that is discernable to normal and abnormal alike
shortened axial length due to compression

34. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
ultrasound
a malingerer may invent a number - thus identifying him- or herself
the cobalt blue filter
patients who have had corneal refractive surgery

35. When performing the TBUT test - the observer is looking for...
a narrow angle and bowed iris cast a shadow on the iris
the appearance of dry spots
0.3 mm
for screening purposes - such as job applications

36. When calculating IOL power - each of the following are necessary except...
pressing on the globe too hard with the probe
a tall - central spike with only one peak and smaller spikes on either site
Allow the patient to adjust to the light level before reading the letters.
white to white corneal diameter

37. Almost all of the formulas for calculating IOL power...
a malingerer may invent a number - thus identifying him- or herself
are based on the same general equation
both eyes equally
to the left of the scleral and orbital echoes

38. The type of pachymetry used to evaluate a glaucoma suspect is...
differentiate between congenital or acquired color blindness
normal tearing
patient wearing spectacles
central corneal thickness

39. Which eye structure is responsible for color vision?
5 minutes
white to white corneal diameter
rods
are based on the same general equation

40. 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)...
reflex tears
narrow beam
to have little or no shadow
A-constant

41. The axial length of an average adult eye is...
the cobalt blue filter
23 to 24 mm
rods
narrow beam

42. Young children can be tested using the color plates by...
the defect tends to remain stable over time
having them trace the number/figure
red-green
is acceptable

43. Acquired color vision defects...
central corneal thickness
can often be cured if the causative factor is eliminated
that the sound beam is directed to the optic disc and the measurement is incorrect
the patient should be tested with near correction - if worn

44. Rose bengal is...
2.0 or more
IOL power
the defect tends to remain stable over time
a staining agent

45. Measuring time for the Schirmer's test is...
5 minutes
545 pm
varies according to the type of test
shortened axial length due to compression

46. 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?
A-constant
one-fourth
5 minutes
having them trace the number/figure

47. Measuring corneal thickness via nonoptical pachymetry involves the use of...
one-fourth
ultrasound
'test eye'
0.3 mm

48. Before proceeding with the actual color plate test...
the patient is shown a sample that is discernable to normal and abnormal alike
shortened axial length due to compression
the cobalt blue filter
Allow the patient to adjust to the light level before reading the letters.

49. The difference between Schirmer's test I and II is...
IOL power
infrared
the use of an anesthetic
that the sound beam is directed to the optic disc and the measurement is incorrect

50. It is important to estimate the anterior chamber depth prior to dilation because...
reflex tears
suspected acquired color defect
2.0 or more
narrow angles may precipitate an angle-closure glaucoma attack