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. One of the keys in accurate pachymetry is...
patients who have had corneal refractive surgery
to the left of the scleral and orbital echoes
2.0 or more
holding the probe perpendicular to the corneal surface

2. The IOLMaster eliminates which of the following sources of error?
a staining agent
differentiate between congenital or acquired color blindness
shortened axial length due to compression
holding the probe perpendicular to the corneal surface

3. Color vision defects in children are frequently detected among those with...
reflex tears
patients who have had corneal refractive surgery
reading disabilities
red-green

4. Which of the following should be color-vision tested one eye at a time?
suspected acquired color defect
Allow the patient to adjust to the light level before reading the letters.
both eyes equally
decrease in vision due to glare conditions

5. When performing a brightness acuity glare test - it is best to do which of the following?
A Schirmer's test of 10 mm or more is considered normal.
infrared
Allow the patient to adjust to the light level before reading the letters.
545 pm

6. If a biometry instrument fails to calibrate properly - one should...
remove the instrument from use
a malingerer may invent a number - thus identifying him- or herself
the patient should be tested with near correction - if worn
a tall - central spike with only one peak and smaller spikes on either site

7. When performing pachymetry prior to refractive surgery - it is generally best to begin...
with the central cornea
focus can he moved off-axis to obtain a clear reading
'test eye'
refractive surgery

8. Rose bengal is...
a staining agent
for screening purposes - such as job applications
refractive error
decrease in vision due to glare conditions

9. Schirmer's test I is used to measure...
the appearance of dry spots
varies according to the type of test
reflex tears
narrow angles may precipitate an angle-closure glaucoma attack

10. The Schirmer's test might be indicated in all of the following except...
more males than females
dacryocystitis
posterior subcapsular cataract
rods

11. 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
having them trace the number/figure
one-fourth
patient wearing spectacles

12. 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
3.0 D
blink
5 minutes

13. When using color plates - a score indicates abnormal color vision...
focus can he moved off-axis to obtain a clear reading
narrow angles may precipitate an angle-closure glaucoma attack
shine the light flatly from the side - in the plane of the iris
varies according to the type of test

14. When calculating IOL power - each of the following are necessary except...
'test eye'
patient wearing spectacles
posterior subcapsular cataract
white to white corneal diameter

15. In evaluating an axial length scan - the retinal echo must be...
reading disabilities
to the left of the scleral and orbital echoes
tear filter papers
remove the instrument from use

16. When calculating intraocular lens (IOL) powers - one must enter...
patient wearing spectacles
expensive equipment
remove the instrument from use
desired postoperative refraction

17. Schirmer's test does not require _____ except Test strips
posterior subcapsular cataract
expensive equipment
central corneal thickness
narrow angles may precipitate an angle-closure glaucoma attack

18. Young children can be tested using the color plates by...
having them trace the number/figure
patients who have had corneal refractive surgery
10 seconds
rods

19. Schirmer's test II is used to measure...
23 to 24 mm
IOL power
blink
normal tearing

20. A rose bengal does not require the use of...
refractive error
the cobalt blue filter
corneal endothelial drop-out
A-constant

21. The axial length of the eye is important in the calculation of...
decrease in vision due to glare conditions
545 pm
the patient should be tested with near correction - if worn
IOL power

22. Hereditary color defects most often fall into which category?
red-green
reflex tears
desired postoperative refraction
0.3 mm

23. Just prior to the beginning of the TBUT test - the patient is instructed to...
narrow beam
blink
before starting school
IOL power

24. Hereditary color vision defects usually affect...
both eyes equally
the patient should be tested with near correction - if worn
is acceptable
severe dry eye

25. When using a penlight to estimate anterior chamber depth - an open angle would appear...
expensive equipment
to have little or no shadow
shine the light flatly from the side - in the plane of the iris
red-green

26. The photosensitive pigments of the eye are sensitive to...
differentiate between congenital or acquired color blindness
A Schirmer's test of 10 mm or more is considered normal.
23 to 24 mm
red - green - and blue

27. When positioning the IOLMaster for the axial length reading...
remove the instrument from use
narrow angles may precipitate an angle-closure glaucoma attack
focus can he moved off-axis to obtain a clear reading
blink

28. _______ are not used in evaluating tear break-up time (TBUT)
holding the probe perpendicular to the corneal surface
white to white corneal diameter
tear filter papers
ultrasound

29. How long should the patient be given to recognize the figure in a color plate?
2 to 3 seconds
0.3 mm
20
2.0 or more

30. 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...
differentiate between congenital or acquired color blindness
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
to the left of the scleral and orbital echoes

31. The Ishihara color plates are useful...
to have little or no shadow
for screening purposes - such as job applications
is acceptable
'test eye'

32. A patient with which of the following potential diagnoses would be tested with bengal?
severe dry eye
reading disabilities
the cobalt blue filter
shine the light flatly from the side - in the plane of the iris

33. Color vision testing is used to detect all of the following except...
differentiate between congenital or acquired color blindness
the appearance of dry spots
a tall - central spike with only one peak and smaller spikes on either site
to the left of the scleral and orbital echoes

34. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
expensive equipment
a staining agent
patients who have had corneal refractive surgery
20

35. It is important to estimate the anterior chamber depth prior to dilation because...
narrow angles may precipitate an angle-closure glaucoma attack
a malingerer may invent a number - thus identifying him- or herself
infrared
2 to 3 seconds

36. Before proceeding with the actual color plate test...
the patient is shown a sample that is discernable to normal and abnormal alike
2.0 or more
ultrasound
red - green - and blue

37. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
patients who have had corneal refractive surgery
more males than females
0.3 mm
the defect tends to remain stable over time

38. When performing the TBUT test - the observer is looking for...
A Schirmer's test of 10 mm or more is considered normal.
holding the probe perpendicular to the corneal surface
the appearance of dry spots
red - green - and blue

39. The difference between Schirmer's test I and II is...
the use of an anesthetic
refractive error
red-green
refractive surgery

40. The ideal IOLMaster axial length graph is...
severe dry eye
a tall - central spike with only one peak and smaller spikes on either site
20
holding the probe perpendicular to the corneal surface

41. Glare testing is used to identify...
narrow angles may precipitate an angle-closure glaucoma attack
decrease in vision due to glare conditions
the patient is shown a sample that is discernable to normal and abnormal alike
desired postoperative refraction

42. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
infrared
narrow beam
a narrow angle and bowed iris cast a shadow on the iris
20

43. Acquired color vision defects...
10 seconds
can often be cured if the causative factor is eliminated
narrow beam
reflex tears

44. Laser interferometry uses which type of laser light?
patient wearing spectacles
the cobalt blue filter
infrared
differentiate between congenital or acquired color blindness

45. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
remove the instrument from use
for screening purposes - such as job applications
shine the light flatly from the side - in the plane of the iris
refractive error

46. An A-Sean can he artificially shortened due to...
pressing on the globe too hard with the probe
red-green
2.0 or more
a tall - central spike with only one peak and smaller spikes on either site

47. Pachymetry readings are routinely taken prior to...
A Schirmer's test of 10 mm or more is considered normal.
for screening purposes - such as job applications
refractive surgery
tear filter papers

48. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
the appearance of dry spots
differentiate between congenital or acquired color blindness
patient wearing spectacles
with the central cornea

49. The average central thickness of the human cornea is...
having them trace the number/figure
545 pm
desired postoperative refraction
rods

50. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
narrow beam
Allow the patient to adjust to the light level before reading the letters.
2.0 or more
with the central cornea