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

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2. The Schirmer's test might be indicated in all of the following except...
desired postoperative refraction
dacryocystitis
refractive error
with the central cornea

3. A TBUT of which of the following would indicate tear film dysfunction?
to have little or no shadow
10 seconds
the patient is shown a sample that is discernable to normal and abnormal alike
tear filter papers

4. Pachymetry readings are routinely taken prior to...
refractive surgery
focus can he moved off-axis to obtain a clear reading
differentiate between congenital or acquired color blindness
for screening purposes - such as job applications

5. Which eye structure is responsible for color vision?
2 to 3 seconds
rods
before starting school
a narrow angle and bowed iris cast a shadow on the iris

6. When positioning the IOLMaster for the axial length reading...
shortened axial length due to compression
differentiate between congenital or acquired color blindness
focus can he moved off-axis to obtain a clear reading
more males than females

7. Color vision defects in children are frequently detected among those with...
corneal endothelial drop-out
pressing on the globe too hard with the probe
10 seconds
reading disabilities

8. When performing the TBUT test - the observer is looking for...
rods
the appearance of dry spots
a tall - central spike with only one peak and smaller spikes on either site
'test eye'

9. This is not evaluated using rose Bengal except...
corneal endothelial drop-out
tear filter papers
the patient is shown a sample that is discernable to normal and abnormal alike
varies according to the type of test administered

10. Color vision testing is used to detect all of the following except...
the patient is shown a sample that is discernable to normal and abnormal alike
differentiate between congenital or acquired color blindness
one-fourth
white to white corneal diameter

11. 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)...
2.0 or more
shortened axial length due to compression
the use of an anesthetic
A-constant

12. The IOLMaster evaluates each of the following except...
a staining agent
refractive error
holding the probe perpendicular to the corneal surface
focus can he moved off-axis to obtain a clear reading

13. The difference between Schirmer's test I and II is...
are based on the same general equation
corneal endothelial drop-out
10 seconds
the use of an anesthetic

14. The type of pachymetry used to evaluate a glaucoma suspect is...
having them trace the number/figure
central corneal thickness
expensive equipment
more males than females

15. When using color plates - a score indicates abnormal color vision...
varies according to the type of test
that the sound beam is directed to the optic disc and the measurement is incorrect
refractive error
the cobalt blue filter

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

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17. Laser interferometry uses which type of laser light?
23 to 24 mm
holding the probe perpendicular to the corneal surface
infrared
red-green

18. How long should the patient be given to recognize the figure in a color plate?
for screening purposes - such as job applications
2 to 3 seconds
normal tearing
the defect tends to remain stable over time

19. In evaluating an axial length scan - the retinal echo must be...
the cobalt blue filter
pressing on the globe too hard with the probe
narrow angles may precipitate an angle-closure glaucoma attack
to the left of the scleral and orbital echoes

20. Which of the following should be color-vision tested one eye at a time?
refractive surgery
white to white corneal diameter
a staining agent
suspected acquired color defect

21. _______ are not used in evaluating tear break-up time (TBUT)
a narrow angle and bowed iris cast a shadow on the iris
having them trace the number/figure
tear filter papers
varies according to the type of test administered

22. An A-Sean can he artificially shortened due to...
to the left of the scleral and orbital echoes
pressing on the globe too hard with the probe
blink
the patient should be tested with near correction - if worn

23. The IOLMaster eliminates which of the following sources of error?
suspected acquired color defect
shortened axial length due to compression
with the central cornea
3.0 D

24. In test a patient with the color pseudoisochromatic plates...
narrow beam
the patient should be tested with near correction - if worn
corneal endothelial drop-out
tear filter papers

25. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
red-green
posterior subcapsular cataract
the defect tends to remain stable over time
the use of an anesthetic

26. Measuring time for the Schirmer's test is...
severe dry eye
5 minutes
0.3 mm
refractive error

27. In which of the following would glare testing be most appropriate?
before starting school
narrow angles may precipitate an angle-closure glaucoma attack
posterior subcapsular cataract
2 to 3 seconds

28. When should a child have his or her color vision checked?
shortened axial length due to compression
before starting school
narrow beam
posterior subcapsular cataract

29. Glare testing is used to identify...
reflex tears
ultrasound
for screening purposes - such as job applications
decrease in vision due to glare conditions

30. When performing pachymetry prior to refractive surgery - it is generally best to begin...
varies according to the type of test
shortened axial length due to compression
with the central cornea
that the sound beam is directed to the optic disc and the measurement is incorrect

31. When calculating intraocular lens (IOL) powers - one must enter...
holding the probe perpendicular to the corneal surface
'test eye'
desired postoperative refraction
patient wearing spectacles

32. 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
refractive error
IOL power

33. When using a penlight to estimate anterior chamber depth - an open angle would appear...
dacryocystitis
Allow the patient to adjust to the light level before reading the letters.
normal tearing
to have little or no shadow

34. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
a narrow angle and bowed iris cast a shadow on the iris
that the sound beam is directed to the optic disc and the measurement is incorrect
narrow beam
differentiate between congenital or acquired color blindness

35. Before proceeding with the actual color plate test...
the patient should be tested with near correction - if worn
the patient is shown a sample that is discernable to normal and abnormal alike
3.0 D
with the central cornea

36. One of the keys in accurate pachymetry is...
holding the probe perpendicular to the corneal surface
decrease in vision due to glare conditions
a tall - central spike with only one peak and smaller spikes on either site
a malingerer may invent a number - thus identifying him- or herself

37. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
varies according to the type of test administered
shine the light flatly from the side - in the plane of the iris
a staining agent
to have little or no shadow

38. A color plate that shows no obvious number to normal and abnormal alike is useful because...
reflex tears
a malingerer may invent a number - thus identifying him- or herself
decrease in vision due to glare conditions
refractive surgery

39. Measuring corneal thickness via nonoptical pachymetry involves the use of...
more males than females
ultrasound
reflex tears
refractive surgery

40. It is important to estimate the anterior chamber depth prior to dilation because...
narrow angles may precipitate an angle-closure glaucoma attack
refractive surgery
that the sound beam is directed to the optic disc and the measurement is incorrect
a narrow angle and bowed iris cast a shadow on the iris

41. The axial length of the eye is important in the calculation of...
tear filter papers
ultrasound
IOL power
the cobalt blue filter

42. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
20
545 pm
narrow angles may precipitate an angle-closure glaucoma attack
refractive error

43. The photosensitive pigments of the eye are sensitive to...
normal tearing
both eyes equally
decrease in vision due to glare conditions
red - green - and blue

44. 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?
the appearance of dry spots
one-fourth
the defect tends to remain stable over time
having them trace the number/figure

45. Hereditary color defects most often fall into which category?
the use of an anesthetic
the defect tends to remain stable over time
dacryocystitis
red-green

46. 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...
pressing on the globe too hard with the probe
a staining agent
one-fourth
that the sound beam is directed to the optic disc and the measurement is incorrect

47. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
patient wearing spectacles
narrow angles may precipitate an angle-closure glaucoma attack
reflex tears
before starting school

48. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
to have little or no shadow
3.0 D
red-green
with the central cornea

49. Illumination for the color plates test...
varies according to the type of test administered
patient wearing spectacles
the patient is shown a sample that is discernable to normal and abnormal alike
to have little or no shadow

50. The Ishihara color plates are useful...
for screening purposes - such as job applications
varies according to the type of test administered
narrow beam
patients who have had corneal refractive surgery