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. Estimating the anterior chamber depth with a penlight works because...
normal tearing
the patient is shown a sample that is discernable to normal and abnormal alike
varies according to the type of test administered
a narrow angle and bowed iris cast a shadow on the iris

2. The photosensitive pigments of the eye are sensitive to...
can often be cured if the causative factor is eliminated
red - green - and blue
the patient should be tested with near correction - if worn
reflex tears

3. Hereditary color vision defects affect...
focus can he moved off-axis to obtain a clear reading
with the central cornea
more males than females
the patient is shown a sample that is discernable to normal and abnormal alike

4. A color plate that shows no obvious number to normal and abnormal alike is useful because...
are based on the same general equation
a malingerer may invent a number - thus identifying him- or herself
dacryocystitis
shine the light flatly from the side - in the plane of the iris

5. Young children can be tested using the color plates by...
having them trace the number/figure
shortened axial length due to compression
the defect tends to remain stable over time
desired postoperative refraction

6. When calculating IOL power - each of the following are necessary except...
shortened axial length due to compression
white to white corneal diameter
refractive surgery
the use of an anesthetic

7. Color vision testing is used to detect all of the following except...
can often be cured if the causative factor is eliminated
remove the instrument from use
10 seconds
differentiate between congenital or acquired color blindness

8. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
that the sound beam is directed to the optic disc and the measurement is incorrect
narrow beam
545 pm
focus can he moved off-axis to obtain a clear reading

9. In evaluating an axial length scan - the retinal echo must be...
dacryocystitis
pressing on the globe too hard with the probe
to the left of the scleral and orbital echoes
ultrasound

10. In test a patient with the color pseudoisochromatic plates...
that the sound beam is directed to the optic disc and the measurement is incorrect
20
posterior subcapsular cataract
the patient should be tested with near correction - if worn

11. Glare testing is used to identify...
a narrow angle and bowed iris cast a shadow on the iris
refractive error
decrease in vision due to glare conditions
red-green

12. When using a penlight to estimate anterior chamber depth - an open angle would appear...
5 minutes
to have little or no shadow
a tall - central spike with only one peak and smaller spikes on either site
severe dry eye

13. The type of pachymetry used to evaluate a glaucoma suspect is...
both eyes equally
red - green - and blue
narrow angles may precipitate an angle-closure glaucoma attack
central corneal thickness

14. Schirmer's test does not require _____ except Test strips
more males than females
545 pm
20
expensive equipment

15. Illumination for the color plates test...
one-fourth
dacryocystitis
shine the light flatly from the side - in the plane of the iris
varies according to the type of test administered

16. 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
reading disabilities
to have little or no shadow
2.0 or more

17. Measuring time for the Schirmer's test is...
having them trace the number/figure
5 minutes
A Schirmer's test of 10 mm or more is considered normal.
posterior subcapsular cataract

18. When performing a brightness acuity glare test - it is best to do which of the following?
A-constant
are based on the same general equation
Allow the patient to adjust to the light level before reading the letters.
holding the probe perpendicular to the corneal surface

19. 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?
white to white corneal diameter
central corneal thickness
refractive error
0.3 mm

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

21. 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)...
desired postoperative refraction
the patient should be tested with near correction - if worn
A-constant
can often be cured if the causative factor is eliminated

22. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
desired postoperative refraction
the patient is shown a sample that is discernable to normal and abnormal alike
shine the light flatly from the side - in the plane of the iris
the patient should be tested with near correction - if worn

23. One of the keys in accurate pachymetry is...
shine the light flatly from the side - in the plane of the iris
holding the probe perpendicular to the corneal surface
white to white corneal diameter
3.0 D

24. When positioning the IOLMaster for the axial length reading...
10 seconds
for screening purposes - such as job applications
focus can he moved off-axis to obtain a clear reading
having them trace the number/figure

25. The ideal IOLMaster axial length graph is...
10 seconds
a tall - central spike with only one peak and smaller spikes on either site
suspected acquired color defect
red-green

26. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
patients who have had corneal refractive surgery
a narrow angle and bowed iris cast a shadow on the iris
red-green
is acceptable

27. Measuring corneal thickness via nonoptical pachymetry involves the use of...
ultrasound
differentiate between congenital or acquired color blindness
normal tearing
refractive error

28. Which eye structure is responsible for color vision?
2.0 or more
rods
red - green - and blue
tear filter papers

29. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
patients who have had corneal refractive surgery
expensive equipment
is acceptable
545 pm

30. Rose bengal is...
patient wearing spectacles
3.0 D
having them trace the number/figure
a staining agent

31. When using color plates - a score indicates abnormal color vision...
severe dry eye
varies according to the type of test
A-constant
red - green - and blue

32. The axial length of an average adult eye is...
central corneal thickness
for screening purposes - such as job applications
tear filter papers
23 to 24 mm

33. 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
5 minutes
shortened axial length due to compression
a narrow angle and bowed iris cast a shadow on the iris

34. The axial length of the eye is important in the calculation of...
are based on the same general equation
IOL power
0.3 mm
the defect tends to remain stable over time

35. The Ishihara color plates are useful...
a tall - central spike with only one peak and smaller spikes on either site
for screening purposes - such as job applications
a malingerer may invent a number - thus identifying him- or herself
severe dry eye

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

37. An A-Sean can he artificially shortened due to...
20
23 to 24 mm
are based on the same general equation
pressing on the globe too hard with the probe

38. This is not evaluated using rose Bengal except...
differentiate between congenital or acquired color blindness
reading disabilities
that the sound beam is directed to the optic disc and the measurement is incorrect
corneal endothelial drop-out

39. Before proceeding with the actual color plate test...
the patient is shown a sample that is discernable to normal and abnormal alike
narrow angles may precipitate an angle-closure glaucoma attack
23 to 24 mm
2.0 or more

40. Pachymetry readings are routinely taken prior to...
patient wearing spectacles
2 to 3 seconds
the defect tends to remain stable over time
refractive surgery

41. A patient with which of the following potential diagnoses would be tested with bengal?
severe dry eye
focus can he moved off-axis to obtain a clear reading
is acceptable
refractive surgery

42. The IOLMaster eliminates which of the following sources of error?
tear filter papers
the patient should be tested with near correction - if worn
shortened axial length due to compression
20

43. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
infrared
differentiate between congenital or acquired color blindness
posterior subcapsular cataract
3.0 D

44. It is important to estimate the anterior chamber depth prior to dilation because...
ultrasound
the defect tends to remain stable over time
narrow angles may precipitate an angle-closure glaucoma attack
severe dry eye

45. Color vision defects in children are frequently detected among those with...
infrared
rods
refractive surgery
reading disabilities

46. Just prior to the beginning of the TBUT test - the patient is instructed to...
having them trace the number/figure
blink
pressing on the globe too hard with the probe
desired postoperative refraction

47. The average central thickness of the human cornea is...
545 pm
patient wearing spectacles
more males than females
the defect tends to remain stable over time

48. Hereditary color vision defects usually affect...
remove the instrument from use
5 minutes
before starting school
both eyes equally

49. How long should the patient be given to recognize the figure in a color plate?
2 to 3 seconds
central corneal thickness
refractive error
suspected acquired color defect

50. Schirmer's test II is used to measure...
both eyes equally
normal tearing
2 to 3 seconds
pressing on the globe too hard with the probe