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. The average central thickness of the human cornea is...
the use of an anesthetic
varies according to the type of test
a staining agent
545 pm

2. Glare testing is used to identify...
varies according to the type of test
normal tearing
reading disabilities
decrease in vision due to glare conditions

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

4. Measuring corneal thickness via nonoptical pachymetry involves the use of...
A-constant
patient wearing spectacles
the patient is shown a sample that is discernable to normal and abnormal alike
ultrasound

5. In test a patient with the color pseudoisochromatic plates...
the patient is shown a sample that is discernable to normal and abnormal alike
ultrasound
the patient should be tested with near correction - if worn
A Schirmer's test of 10 mm or more is considered normal.

6. The Schirmer's test might be indicated in all of the following except...
infrared
rods
more males than females
dacryocystitis

7. The ideal IOLMaster axial length graph is...
a tall - central spike with only one peak and smaller spikes on either site
the appearance of dry spots
is acceptable
focus can he moved off-axis to obtain a clear reading

8. Color vision testing is used to detect all of the following except...
differentiate between congenital or acquired color blindness
23 to 24 mm
both eyes equally
a malingerer may invent a number - thus identifying him- or herself

9. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
both eyes equally
the defect tends to remain stable over time
3.0 D
patients who have had corneal refractive surgery

10. If a biometry instrument fails to calibrate properly - one should...
reflex tears
remove the instrument from use
can often be cured if the causative factor is eliminated
23 to 24 mm

11. Acquired color vision defects...
varies according to the type of test
can often be cured if the causative factor is eliminated
red-green
before starting school

12. Just prior to the beginning of the TBUT test - the patient is instructed to...
narrow beam
the patient is shown a sample that is discernable to normal and abnormal alike
blink
the appearance of dry spots

13. The axial length of an average adult eye is...
a narrow angle and bowed iris cast a shadow on the iris
normal tearing
ultrasound
23 to 24 mm

14. Pachymetry readings are routinely taken prior to...
3.0 D
red-green
the appearance of dry spots
refractive surgery

15. 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?
shortened axial length due to compression
pressing on the globe too hard with the probe
blink
0.3 mm

16. Hereditary color vision defects usually affect...
to have little or no shadow
pressing on the globe too hard with the probe
ultrasound
both eyes equally

17. The IOLMaster eliminates which of the following sources of error?
shortened axial length due to compression
refractive surgery
with the central cornea
patients who have had corneal refractive surgery

18. Hereditary color vision defects affect...
23 to 24 mm
more males than females
expensive equipment
20

19. When calculating intraocular lens (IOL) powers - one must enter...
0.3 mm
a staining agent
tear filter papers
desired postoperative refraction

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

21. 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)...
suspected acquired color defect
holding the probe perpendicular to the corneal surface
A-constant
central corneal thickness

22. It is important to estimate the anterior chamber depth prior to dilation because...
are based on the same general equation
2 to 3 seconds
narrow angles may precipitate an angle-closure glaucoma attack
posterior subcapsular cataract

23. 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?
a narrow angle and bowed iris cast a shadow on the iris
both eyes equally
one-fourth
desired postoperative refraction

24. Young children can be tested using the color plates by...
with the central cornea
patient wearing spectacles
having them trace the number/figure
corneal endothelial drop-out

25. Schirmer's test II is used to measure...
suspected acquired color defect
normal tearing
A Schirmer's test of 10 mm or more is considered normal.
2 to 3 seconds

26. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
3.0 D
refractive error
the cobalt blue filter
is acceptable

27. Estimating the anterior chamber depth with a penlight works because...
a narrow angle and bowed iris cast a shadow on the iris
narrow angles may precipitate an angle-closure glaucoma attack
reading disabilities
IOL power

28. When should a child have his or her color vision checked?
23 to 24 mm
suspected acquired color defect
are based on the same general equation
before starting school

29. Which of the following should be color-vision tested one eye at a time?
suspected acquired color defect
expensive equipment
that the sound beam is directed to the optic disc and the measurement is incorrect
'test eye'

30. In which of the following would glare testing be most appropriate?
blink
posterior subcapsular cataract
10 seconds
expensive equipment

31. Laser interferometry uses which type of laser light?
infrared
having them trace the number/figure
narrow angles may precipitate an angle-closure glaucoma attack
can often be cured if the causative factor is eliminated

32. A patient with which of the following potential diagnoses would be tested with bengal?
a malingerer may invent a number - thus identifying him- or herself
severe dry eye
corneal endothelial drop-out
23 to 24 mm

33. Color vision defects in children are frequently detected among those with...
posterior subcapsular cataract
patient wearing spectacles
IOL power
reading disabilities

34. Before proceeding with the actual color plate test...
shortened axial length due to compression
refractive surgery
20
the patient is shown a sample that is discernable to normal and abnormal alike

35. A color plate that shows no obvious number to normal and abnormal alike is useful because...
can often be cured if the causative factor is eliminated
varies according to the type of test
a malingerer may invent a number - thus identifying him- or herself
the use of an anesthetic

36. In evaluating an axial length scan - the retinal echo must be...
5 minutes
to the left of the scleral and orbital echoes
patient wearing spectacles
are based on the same general equation

37. When performing the TBUT test - the observer is looking for...
'test eye'
IOL power
having them trace the number/figure
the appearance of dry spots

38. _______ are not used in evaluating tear break-up time (TBUT)
both eyes equally
tear filter papers
having them trace the number/figure
to the left of the scleral and orbital echoes

39. When using a penlight to estimate anterior chamber depth - an open angle would appear...
A Schirmer's test of 10 mm or more is considered normal.
to have little or no shadow
shortened axial length due to compression
differentiate between congenital or acquired color blindness

40. The Ishihara color plates are useful...
for screening purposes - such as job applications
reading disabilities
shortened axial length due to compression
infrared

41. 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...
holding the probe perpendicular to the corneal surface
one-fourth
that the sound beam is directed to the optic disc and the measurement is incorrect
the cobalt blue filter

42. Which eye structure is responsible for color vision?
shortened axial length due to compression
can often be cured if the causative factor is eliminated
rods
is acceptable

43. When using color plates - a score indicates abnormal color vision...
varies according to the type of test
red - green - and blue
2 to 3 seconds
20

44. Measuring time for the Schirmer's test is...
A-constant
5 minutes
23 to 24 mm
the cobalt blue filter

45. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
ultrasound
narrow beam
severe dry eye
the patient is shown a sample that is discernable to normal and abnormal alike

46. An A-Sean can he artificially shortened due to...
A Schirmer's test of 10 mm or more is considered normal.
suspected acquired color defect
10 seconds
pressing on the globe too hard with the probe

47. The axial length of the eye is important in the calculation of...
the patient is shown a sample that is discernable to normal and abnormal alike
a tall - central spike with only one peak and smaller spikes on either site
3.0 D
IOL power

48. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
red-green
patient wearing spectacles
a malingerer may invent a number - thus identifying him- or herself
differentiate between congenital or acquired color blindness

49. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
a malingerer may invent a number - thus identifying him- or herself
varies according to the type of test
shortened axial length due to compression
20

50. Schirmer's test I is used to measure...
20
rods
to the left of the scleral and orbital echoes
reflex tears