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. Which eye structure is responsible for color vision?
rods
pressing on the globe too hard with the probe
'test eye'
545 pm

2. Schirmer's test I is used to measure...
is acceptable
reflex tears
a malingerer may invent a number - thus identifying him- or herself
red - green - and blue

3. This is not evaluated using rose Bengal except...
corneal endothelial drop-out
desired postoperative refraction
shortened axial length due to compression
varies according to the type of test

4. The average central thickness of the human cornea is...
545 pm
0.3 mm
A Schirmer's test of 10 mm or more is considered normal.
are based on the same general equation

5. 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
A-constant
before starting school
Allow the patient to adjust to the light level before reading the letters.

6. In evaluating an axial length scan - the retinal echo must be...
with the central cornea
having them trace the number/figure
differentiate between congenital or acquired color blindness
to the left of the scleral and orbital echoes

7. It is important to estimate the anterior chamber depth prior to dilation because...
0.3 mm
narrow angles may precipitate an angle-closure glaucoma attack
Allow the patient to adjust to the light level before reading the letters.
the cobalt blue filter

8. Rose bengal is...
a staining agent
for screening purposes - such as job applications
shortened axial length due to compression
more males than females

9. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
narrow beam
dacryocystitis
varies according to the type of test administered
narrow angles may precipitate an angle-closure glaucoma attack

10. Illumination for the color plates test...
reading disabilities
varies according to the type of test administered
having them trace the number/figure
patients who have had corneal refractive surgery

11. When performing the TBUT test - the observer is looking for...
the appearance of dry spots
is acceptable
refractive surgery
545 pm

12. The axial length of the eye is important in the calculation of...
blink
shortened axial length due to compression
IOL power
3.0 D

13. When using color plates - a score indicates abnormal color vision...
is acceptable
refractive error
varies according to the type of test
5 minutes

14. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
the appearance of dry spots
patients who have had corneal refractive surgery
infrared
the cobalt blue filter

15. Measuring corneal thickness via nonoptical pachymetry involves the use of...
ultrasound
narrow angles may precipitate an angle-closure glaucoma attack
2 to 3 seconds
can often be cured if the causative factor is eliminated

16. If a biometry instrument fails to calibrate properly - one should...
remove the instrument from use
20
5 minutes
one-fourth

17. The type of pachymetry used to evaluate a glaucoma suspect is...
central corneal thickness
focus can he moved off-axis to obtain a clear reading
remove the instrument from use
rods

18. When should a child have his or her color vision checked?
dacryocystitis
red - green - and blue
10 seconds
before starting school

19. Which of the following should be color-vision tested one eye at a time?
normal tearing
suspected acquired color defect
reading disabilities
shortened axial length due to compression

20. A patient with which of the following potential diagnoses would be tested with bengal?
varies according to the type of test administered
that the sound beam is directed to the optic disc and the measurement is incorrect
severe dry eye
is acceptable

21. When using a penlight to estimate anterior chamber depth - an open angle would appear...
to have little or no shadow
patients who have had corneal refractive surgery
rods
a narrow angle and bowed iris cast a shadow on the iris

22. The photosensitive pigments of the eye are sensitive to...
infrared
refractive surgery
red - green - and blue
having them trace the number/figure

23. 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
23 to 24 mm
remove the instrument from use
more males than females

24. Measuring time for the Schirmer's test is...
refractive error
that the sound beam is directed to the optic disc and the measurement is incorrect
5 minutes
the use of an anesthetic

25. The IOLMaster eliminates which of the following sources of error?
corneal endothelial drop-out
10 seconds
shine the light flatly from the side - in the plane of the iris
shortened axial length due to compression

26. Color vision testing is used to detect all of the following except...
refractive surgery
shine the light flatly from the side - in the plane of the iris
refractive error
differentiate between congenital or acquired color blindness

27. In test a patient with the color pseudoisochromatic plates...
the patient should be tested with near correction - if worn
both eyes equally
red-green
infrared

28. The IOLMaster evaluates each of the following except...
refractive error
is acceptable
before starting school
rods

29. Just prior to the beginning of the TBUT test - the patient is instructed to...
the use of an anesthetic
blink
the appearance of dry spots
a malingerer may invent a number - thus identifying him- or herself

30. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
20
shortened axial length due to compression
with the central cornea
shine the light flatly from the side - in the plane of the iris

31. When performing pachymetry prior to refractive surgery - it is generally best to begin...
with the central cornea
2 to 3 seconds
focus can he moved off-axis to obtain a clear reading
severe dry eye

32. When calculating intraocular lens (IOL) powers - one must enter...
desired postoperative refraction
for screening purposes - such as job applications
red - green - and blue
severe dry eye

33. A rose bengal does not require the use of...
red-green
infrared
decrease in vision due to glare conditions
the cobalt blue filter

34. An A-Sean can he artificially shortened due to...
pressing on the globe too hard with the probe
dacryocystitis
can often be cured if the causative factor is eliminated
normal tearing

35. Hereditary color vision defects usually affect...
'test eye'
both eyes equally
red - green - and blue
IOL power

36. When positioning the IOLMaster for the axial length reading...
to the left of the scleral and orbital echoes
refractive surgery
red - green - and blue
focus can he moved off-axis to obtain a clear reading

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

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38. 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 error
dacryocystitis
0.3 mm
a staining agent

39. 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
both eyes equally
a tall - central spike with only one peak and smaller spikes on either site
with the central cornea

40. Schirmer's test does not require _____ except Test strips
white to white corneal diameter
expensive equipment
545 pm
A Schirmer's test of 10 mm or more is considered normal.

41. Color vision defects in children are frequently detected among those with...
the use of an anesthetic
reading disabilities
A Schirmer's test of 10 mm or more is considered normal.
with the central cornea

42. In which of the following would glare testing be most appropriate?
varies according to the type of test administered
refractive error
posterior subcapsular cataract
Allow the patient to adjust to the light level before reading the letters.

43. How long should the patient be given to recognize the figure in a color plate?
'test eye'
2 to 3 seconds
the cobalt blue filter
Allow the patient to adjust to the light level before reading the letters.

44. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
can often be cured if the causative factor is eliminated
reading disabilities
the defect tends to remain stable over time
focus can he moved off-axis to obtain a clear reading

45. Before proceeding with the actual color plate test...
reflex tears
normal tearing
the patient is shown a sample that is discernable to normal and abnormal alike
rods

46. Hereditary color defects most often fall into which category?
dacryocystitis
a malingerer may invent a number - thus identifying him- or herself
holding the probe perpendicular to the corneal surface
red-green

47. Almost all of the formulas for calculating IOL power...
with the central cornea
both eyes equally
are based on the same general equation
a narrow angle and bowed iris cast a shadow on the iris

48. Schirmer's test II is used to measure...
the patient is shown a sample that is discernable to normal and abnormal alike
normal tearing
patients who have had corneal refractive surgery
reading disabilities

49. 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
desired postoperative refraction
3.0 D

50. Hereditary color vision defects affect...
having them trace the number/figure
more males than females
reading disabilities
shine the light flatly from the side - in the plane of the iris