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. Illumination for the color plates test...
A Schirmer's test of 10 mm or more is considered normal.
reflex tears
varies according to the type of test administered
2 to 3 seconds

2. A patient with which of the following potential diagnoses would be tested with bengal?
a narrow angle and bowed iris cast a shadow on the iris
before starting school
20
severe dry eye

3. Young children can be tested using the color plates by...
desired postoperative refraction
10 seconds
having them trace the number/figure
infrared

4. If a biometry instrument fails to calibrate properly - one should...
with the central cornea
differentiate between congenital or acquired color blindness
remove the instrument from use
a tall - central spike with only one peak and smaller spikes on either site

5. The Schirmer's test might be indicated in all of the following except...
a malingerer may invent a number - thus identifying him- or herself
23 to 24 mm
having them trace the number/figure
dacryocystitis

6. The photosensitive pigments of the eye are sensitive to...
red - green - and blue
before starting school
pressing on the globe too hard with the probe
varies according to the type of test

7. When using a penlight to estimate anterior chamber depth - an open angle would appear...
a tall - central spike with only one peak and smaller spikes on either site
to have little or no shadow
patients who have had corneal refractive surgery
23 to 24 mm

8. Measuring time for the Schirmer's test is...
5 minutes
A Schirmer's test of 10 mm or more is considered normal.
both eyes equally
to have little or no shadow

9. When calculating intraocular lens (IOL) powers - one must enter...
central corneal thickness
with the central cornea
refractive error
desired postoperative refraction

10. One of the keys in accurate pachymetry is...
refractive surgery
holding the probe perpendicular to the corneal surface
differentiate between congenital or acquired color blindness
red - green - and blue

11. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
patient wearing spectacles
normal tearing
varies according to the type of test
narrow beam

12. A color plate that shows no obvious number to normal and abnormal alike is useful because...
desired postoperative refraction
both eyes equally
20
a malingerer may invent a number - thus identifying him- or herself

13. Which of the following should be color-vision tested one eye at a time?
A Schirmer's test of 10 mm or more is considered normal.
suspected acquired color defect
the appearance of dry spots
varies according to the type of test

14. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
23 to 24 mm
differentiate between congenital or acquired color blindness
with the central cornea
3.0 D

15. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
patients who have had corneal refractive surgery
holding the probe perpendicular to the corneal surface
reflex tears
A-constant

16. Almost all of the formulas for calculating IOL power...
are based on the same general equation
posterior subcapsular cataract
dacryocystitis
2.0 or more

17. When positioning the IOLMaster for the axial length reading...
refractive surgery
focus can he moved off-axis to obtain a clear reading
patients who have had corneal refractive surgery
before starting school

18. It is important to estimate the anterior chamber depth prior to dilation because...
corneal endothelial drop-out
severe dry eye
A-constant
narrow angles may precipitate an angle-closure glaucoma attack

19. The difference between Schirmer's test I and II is...
2.0 or more
the use of an anesthetic
0.3 mm
refractive surgery

20. 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?
2 to 3 seconds
one-fourth
0.3 mm
more males than females

21. When performing pachymetry prior to refractive surgery - it is generally best to begin...
Allow the patient to adjust to the light level before reading the letters.
holding the probe perpendicular to the corneal surface
refractive surgery
with the central cornea

22. This is not evaluated using rose Bengal except...
corneal endothelial drop-out
tear filter papers
red - green - and blue
a narrow angle and bowed iris cast a shadow on the iris

23. With the 1OLMaster - the ideal signal-to-noise ratio is...
the use of an anesthetic
infrared
2.0 or more
normal tearing

24. A rose bengal does not require the use of...
refractive error
red-green
the cobalt blue filter
0.3 mm

25. Acquired color vision defects...
the cobalt blue filter
refractive surgery
can often be cured if the causative factor is eliminated
decrease in vision due to glare conditions

26. Just prior to the beginning of the TBUT test - the patient is instructed to...
blink
having them trace the number/figure
reflex tears
focus can he moved off-axis to obtain a clear reading

27. How long should the patient be given to recognize the figure in a color plate?
545 pm
corneal endothelial drop-out
A Schirmer's test of 10 mm or more is considered normal.
2 to 3 seconds

28. Estimating the anterior chamber depth with a penlight works because...
the patient should be tested with near correction - if worn
0.3 mm
infrared
a narrow angle and bowed iris cast a shadow on the iris

29. In which of the following would glare testing be most appropriate?
posterior subcapsular cataract
remove the instrument from use
10 seconds
varies according to the type of test

30. When using color plates - a score indicates abnormal color vision...
that the sound beam is directed to the optic disc and the measurement is incorrect
having them trace the number/figure
IOL power
varies according to the type of test

31. The axial length of an average adult eye is...
patients who have had corneal refractive surgery
23 to 24 mm
varies according to the type of test administered
red-green

32. In test a patient with the color pseudoisochromatic plates...
tear filter papers
narrow angles may precipitate an angle-closure glaucoma attack
the patient should be tested with near correction - if worn
20

33. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
tear filter papers
more males than females
545 pm
shine the light flatly from the side - in the plane of the iris

34. 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
can often be cured if the causative factor is eliminated
narrow angles may precipitate an angle-closure glaucoma attack
545 pm

35. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
patient wearing spectacles
narrow beam
with the central cornea
the patient is shown a sample that is discernable to normal and abnormal alike

36. The IOLMaster evaluates each of the following except...
narrow angles may precipitate an angle-closure glaucoma attack
can often be cured if the causative factor is eliminated
3.0 D
refractive error

37. An A-Sean can he artificially shortened due to...
the cobalt blue filter
decrease in vision due to glare conditions
one-fourth
pressing on the globe too hard with the probe

38. Pachymetry readings are routinely taken prior to...
refractive surgery
white to white corneal diameter
a tall - central spike with only one peak and smaller spikes on either site
one-fourth

39. The average central thickness of the human cornea is...
red-green
545 pm
red - green - and blue
are based on the same general equation

40. The IOLMaster eliminates which of the following sources of error?
desired postoperative refraction
the use of an anesthetic
having them trace the number/figure
shortened axial length due to compression

41. Hereditary color defects most often fall into which category?
ultrasound
remove the instrument from use
red-green
refractive error

42. Rose bengal is...
central corneal thickness
focus can he moved off-axis to obtain a clear reading
a staining agent
narrow beam

43. Color vision defects in children are frequently detected among those with...
reading disabilities
posterior subcapsular cataract
red - green - and blue
white to white corneal diameter

44. 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?
5 minutes
dacryocystitis
normal tearing
0.3 mm

45. Schirmer's test does not require _____ except Test strips
'test eye'
20
expensive equipment
A-constant

46. Glare testing is used to identify...
having them trace the number/figure
one-fourth
23 to 24 mm
decrease in vision due to glare conditions

47. In evaluating an axial length scan - the retinal echo must be...
can often be cured if the causative factor is eliminated
to the left of the scleral and orbital echoes
decrease in vision due to glare conditions
'test eye'

48. The type of pachymetry used to evaluate a glaucoma suspect is...
with the central cornea
shortened axial length due to compression
are based on the same general equation
central corneal thickness

49. Hereditary color vision defects affect...
2 to 3 seconds
the defect tends to remain stable over time
more males than females
both eyes equally

50. Measuring corneal thickness via nonoptical pachymetry involves the use of...
Allow the patient to adjust to the light level before reading the letters.
ultrasound
dacryocystitis
corneal endothelial drop-out