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 axial length of an average adult eye is...
one-fourth
reading disabilities
23 to 24 mm
differentiate between congenital or acquired color blindness

2. _______ are not used in evaluating tear break-up time (TBUT)
A-constant
tear filter papers
to have little or no shadow
can often be cured if the causative factor is eliminated

3. 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?
one-fourth
20
the patient is shown a sample that is discernable to normal and abnormal alike
both eyes equally

4. In evaluating an axial length scan - the retinal echo must be...
patient wearing spectacles
to the left of the scleral and orbital echoes
the patient should be tested with near correction - if worn
reading disabilities

5. 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.
'test eye'
shortened axial length due to compression
the cobalt blue filter

6. In test a patient with the color pseudoisochromatic plates...
the patient should be tested with near correction - if worn
5 minutes
shortened axial length due to compression
the use of an anesthetic

7. 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
red-green
one-fourth
the patient should be tested with near correction - if worn

8. One of the keys in accurate pachymetry is...
holding the probe perpendicular to the corneal surface
20
varies according to the type of test administered
patient wearing spectacles

9. Measuring time for the Schirmer's test is...
patient wearing spectacles
5 minutes
pressing on the globe too hard with the probe
a malingerer may invent a number - thus identifying him- or herself

10. The IOLMaster eliminates which of the following sources of error?
A Schirmer's test of 10 mm or more is considered normal.
shortened axial length due to compression
10 seconds
normal tearing

11. Measuring corneal thickness via nonoptical pachymetry involves the use of...
ultrasound
desired postoperative refraction
suspected acquired color defect
the appearance of dry spots

12. Pachymetry readings are routinely taken prior to...
blink
narrow beam
refractive surgery
infrared

13. A rose bengal does not require the use of...
the appearance of dry spots
normal tearing
to have little or no shadow
the cobalt blue filter

14. Hereditary color vision defects affect...
more males than females
red-green
reflex tears
before starting school

15. Just prior to the beginning of the TBUT test - the patient is instructed to...
before starting school
the patient should be tested with near correction - if worn
blink
A Schirmer's test of 10 mm or more is considered normal.

16. An A-Sean can he artificially shortened due to...
that the sound beam is directed to the optic disc and the measurement is incorrect
having them trace the number/figure
pressing on the globe too hard with the probe
23 to 24 mm

17. Color vision defects in children are frequently detected among those with...
545 pm
reading disabilities
expensive equipment
varies according to the type of test

18. Hereditary color vision defects usually affect...
both eyes equally
red-green
expensive equipment
the cobalt blue filter

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?
0.3 mm
for screening purposes - such as job applications
patient wearing spectacles
posterior subcapsular cataract

20. Young children can be tested using the color plates by...
10 seconds
'test eye'
having them trace the number/figure
infrared

21. When using color plates - a score indicates abnormal color vision...
varies according to the type of test
corneal endothelial drop-out
pressing on the globe too hard with the probe
more males than females

22. Before proceeding with the actual color plate test...
white to white corneal diameter
the patient is shown a sample that is discernable to normal and abnormal alike
refractive surgery
2.0 or more

23. How long should the patient be given to recognize the figure in a color plate?
severe dry eye
to have little or no shadow
can often be cured if the causative factor is eliminated
2 to 3 seconds

24. Almost all of the formulas for calculating IOL power...
20
holding the probe perpendicular to the corneal surface
can often be cured if the causative factor is eliminated
are based on the same general equation

25. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
3.0 D
infrared
varies according to the type of test
expensive equipment

26. Illumination for the color plates test...
0.3 mm
varies according to the type of test administered
decrease in vision due to glare conditions
severe dry eye

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

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28. Laser interferometry uses which type of laser light?
23 to 24 mm
the patient should be tested with near correction - if worn
the use of an anesthetic
infrared

29. With the 1OLMaster - the ideal signal-to-noise ratio is...
shine the light flatly from the side - in the plane of the iris
desired postoperative refraction
2.0 or more
reading disabilities

30. 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)...
the cobalt blue filter
decrease in vision due to glare conditions
A-constant
for screening purposes - such as job applications

31. A patient with which of the following potential diagnoses would be tested with bengal?
with the central cornea
severe dry eye
more males than females
A-constant

32. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
more males than females
both eyes equally
'test eye'
the defect tends to remain stable over time

33. Which eye structure is responsible for color vision?
rods
reflex tears
expensive equipment
10 seconds

34. The axial length of the eye is important in the calculation of...
IOL power
pressing on the globe too hard with the probe
a narrow angle and bowed iris cast a shadow on the iris
refractive error

35. 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
refractive surgery
reflex tears
3.0 D

36. When calculating intraocular lens (IOL) powers - one must enter...
blink
is acceptable
desired postoperative refraction
narrow beam

37. Glare testing is used to identify...
corneal endothelial drop-out
a narrow angle and bowed iris cast a shadow on the iris
decrease in vision due to glare conditions
the cobalt blue filter

38. Schirmer's test I is used to measure...
reflex tears
0.3 mm
narrow beam
10 seconds

39. When using a penlight to estimate anterior chamber depth - an open angle would appear...
narrow angles may precipitate an angle-closure glaucoma attack
2 to 3 seconds
to have little or no shadow
to the left of the scleral and orbital echoes

40. When performing pachymetry prior to refractive surgery - it is generally best to begin...
focus can he moved off-axis to obtain a clear reading
with the central cornea
expensive equipment
corneal endothelial drop-out

41. The IOLMaster evaluates each of the following except...
patient wearing spectacles
a staining agent
pressing on the globe too hard with the probe
refractive error

42. This is not evaluated using rose Bengal except...
corneal endothelial drop-out
a staining agent
normal tearing
focus can he moved off-axis to obtain a clear reading

43. It is important to estimate the anterior chamber depth prior to dilation because...
patient wearing spectacles
narrow angles may precipitate an angle-closure glaucoma attack
desired postoperative refraction
a malingerer may invent a number - thus identifying him- or herself

44. The ideal IOLMaster axial length graph is...
a tall - central spike with only one peak and smaller spikes on either site
normal tearing
a staining agent
red-green

45. Which of the following should be color-vision tested one eye at a time?
suspected acquired color defect
posterior subcapsular cataract
to have little or no shadow
narrow angles may precipitate an angle-closure glaucoma attack

46. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
infrared
shine the light flatly from the side - in the plane of the iris
one-fourth
both eyes equally

47. Schirmer's test does not require _____ except Test strips
expensive equipment
one-fourth
both eyes equally
A-constant

48. When positioning the IOLMaster for the axial length reading...
a narrow angle and bowed iris cast a shadow on the iris
before starting school
focus can he moved off-axis to obtain a clear reading
desired postoperative refraction

49. The Schirmer's test might be indicated in all of the following except...
to have little or no shadow
remove the instrument from use
dacryocystitis
A-constant

50. Hereditary color defects most often fall into which category?
red-green
545 pm
23 to 24 mm
tear filter papers