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?
23 to 24 mm
patient wearing spectacles
shortened axial length due to compression
posterior subcapsular cataract

2. When using a penlight to estimate anterior chamber depth - an open angle would appear...
to have little or no shadow
red - green - and blue
both eyes equally
refractive error

3. Schirmer's test II is used to measure...
normal tearing
pressing on the globe too hard with the probe
white to white corneal diameter
the patient should be tested with near correction - if worn

4. With the 1OLMaster - the ideal signal-to-noise ratio is...
desired postoperative refraction
dacryocystitis
one-fourth
2.0 or more

5. It is important to estimate the anterior chamber depth prior to dilation because...
focus can he moved off-axis to obtain a clear reading
narrow beam
narrow angles may precipitate an angle-closure glaucoma attack
pressing on the globe too hard with the probe

6. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
suspected acquired color defect
before starting school
shine the light flatly from the side - in the plane of the iris
severe dry eye

7. Color vision testing is used to detect all of the following except...
focus can he moved off-axis to obtain a clear reading
white to white corneal diameter
differentiate between congenital or acquired color blindness
10 seconds

8. Hereditary color vision defects affect...
holding the probe perpendicular to the corneal surface
more males than females
corneal endothelial drop-out
suspected acquired color defect

9. When performing the TBUT test - the observer is looking for...
white to white corneal diameter
shine the light flatly from the side - in the plane of the iris
the appearance of dry spots
can often be cured if the causative factor is eliminated

10. An A-Sean can he artificially shortened due to...
with the central cornea
2.0 or more
pressing on the globe too hard with the probe
both eyes equally

11. When positioning the IOLMaster for the axial length reading...
both eyes equally
for screening purposes - such as job applications
refractive error
focus can he moved off-axis to obtain a clear reading

12. When performing pachymetry prior to refractive surgery - it is generally best to begin...
with the central cornea
10 seconds
a narrow angle and bowed iris cast a shadow on the iris
holding the probe perpendicular to the corneal surface

13. Measuring corneal thickness via nonoptical pachymetry involves the use of...
ultrasound
3.0 D
more males than females
narrow beam

14. The IOLMaster evaluates each of the following except...
3.0 D
remove the instrument from use
desired postoperative refraction
refractive error

15. A rose bengal does not require the use of...
varies according to the type of test administered
narrow angles may precipitate an angle-closure glaucoma attack
severe dry eye
the cobalt blue filter

16. Which eye structure is responsible for color vision?
shine the light flatly from the side - in the plane of the iris
corneal endothelial drop-out
rods
more males than females

17. The ideal IOLMaster axial length graph is...
corneal endothelial drop-out
for screening purposes - such as job applications
remove the instrument from use
a tall - central spike with only one peak and smaller spikes on either site

18. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
posterior subcapsular cataract
with the central cornea
'test eye'
is acceptable

19. The Schirmer's test might be indicated in all of the following except...
2.0 or more
A-constant
tear filter papers
dacryocystitis

20. _______ are not used in evaluating tear break-up time (TBUT)
reflex tears
tear filter papers
the patient is shown a sample that is discernable to normal and abnormal alike
shortened axial length due to compression

21. When using color plates - a score indicates abnormal color vision...
varies according to the type of test
Allow the patient to adjust to the light level before reading the letters.
20
rods

22. The average central thickness of the human cornea is...
for screening purposes - such as job applications
IOL power
a tall - central spike with only one peak and smaller spikes on either site
545 pm

23. Almost all of the formulas for calculating IOL power...
white to white corneal diameter
are based on the same general equation
the patient should be tested with near correction - if worn
red-green

24. Rose bengal is...
the patient is shown a sample that is discernable to normal and abnormal alike
with the central cornea
a staining agent
reading disabilities

25. Pachymetry readings are routinely taken prior to...
differentiate between congenital or acquired color blindness
20
refractive surgery
patients who have had corneal refractive surgery

26. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
severe dry eye
varies according to the type of test
white to white corneal diameter
narrow beam

27. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
shine the light flatly from the side - in the plane of the iris
patients who have had corneal refractive surgery
is acceptable
narrow angles may precipitate an angle-closure glaucoma attack

28. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
infrared
20
a staining agent
a tall - central spike with only one peak and smaller spikes on either site

29. Hereditary color vision defects usually affect...
to the left of the scleral and orbital echoes
both eyes equally
patients who have had corneal refractive surgery
2 to 3 seconds

30. When calculating IOL power - each of the following are necessary except...
both eyes equally
blink
white to white corneal diameter
narrow angles may precipitate an angle-closure glaucoma attack

31. The IOLMaster eliminates which of the following sources of error?
shortened axial length due to compression
to have little or no shadow
Allow the patient to adjust to the light level before reading the letters.
having them trace the number/figure

32. The difference between Schirmer's test I and II is...
Allow the patient to adjust to the light level before reading the letters.
the use of an anesthetic
narrow beam
is acceptable

33. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
more males than females
a staining agent
central corneal thickness
3.0 D

34. When should a child have his or her color vision checked?
the cobalt blue filter
before starting school
white to white corneal diameter
IOL power

35. Acquired color vision defects...
focus can he moved off-axis to obtain a clear reading
can often be cured if the causative factor is eliminated
before starting school
white to white corneal diameter

36. The type of pachymetry used to evaluate a glaucoma suspect is...
central corneal thickness
red - green - and blue
patients who have had corneal refractive surgery
10 seconds

37. The photosensitive pigments of the eye are sensitive to...
2 to 3 seconds
rods
3.0 D
red - green - and blue

38. One of the keys in accurate pachymetry is...
the appearance of dry spots
holding the probe perpendicular to the corneal surface
shine the light flatly from the side - in the plane of the iris
differentiate between congenital or acquired color blindness

39. A patient with which of the following potential diagnoses would be tested with bengal?
20
severe dry eye
Allow the patient to adjust to the light level before reading the letters.
shortened axial length due to compression

40. In evaluating an axial length scan - the retinal echo must be...
2.0 or more
to the left of the scleral and orbital echoes
remove the instrument from use
rods

41. If a biometry instrument fails to calibrate properly - one should...
a staining agent
central corneal thickness
remove the instrument from use
dacryocystitis

42. Just prior to the beginning of the TBUT test - the patient is instructed to...
more males than females
20
blink
A-constant

43. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
10 seconds
the defect tends to remain stable over time
infrared
for screening purposes - such as job applications

44. In test a patient with the color pseudoisochromatic plates...
0.3 mm
the patient should be tested with near correction - if worn
10 seconds
A-constant

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

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46. A color plate that shows no obvious number to normal and abnormal alike is useful because...
red - green - and blue
the patient should be tested with near correction - if worn
a malingerer may invent a number - thus identifying him- or herself
tear filter papers

47. The axial length of the eye is important in the calculation of...
holding the probe perpendicular to the corneal surface
20
corneal endothelial drop-out
IOL power

48. Color vision defects in children are frequently detected among those with...
normal tearing
reading disabilities
a narrow angle and bowed iris cast a shadow on the iris
is acceptable

49. Schirmer's test I is used to measure...
corneal endothelial drop-out
reflex tears
decrease in vision due to glare conditions
23 to 24 mm

50. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
rods
2.0 or more
patient wearing spectacles
pressing on the globe too hard with the probe