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. Hereditary color defects most often fall into which category?
red - green - and blue
decrease in vision due to glare conditions
red-green
IOL power

2. The Ishihara color plates are useful...
both eyes equally
severe dry eye
blink
for screening purposes - such as job applications

3. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
'test eye'
a narrow angle and bowed iris cast a shadow on the iris
patients who have had corneal refractive surgery
before starting school

4. The axial length of the eye is important in the calculation of...
posterior subcapsular cataract
patients who have had corneal refractive surgery
more males than females
IOL power

5. The IOLMaster evaluates each of the following except...
more males than females
refractive error
shortened axial length due to compression
to the left of the scleral and orbital echoes

6. When using a penlight to estimate anterior chamber depth - an open angle would appear...
having them trace the number/figure
to have little or no shadow
posterior subcapsular cataract
red - green - and blue

7. When positioning the IOLMaster for the axial length reading...
A Schirmer's test of 10 mm or more is considered normal.
focus can he moved off-axis to obtain a clear reading
'test eye'
varies according to the type of test administered

8. In test a patient with the color pseudoisochromatic plates...
the patient should be tested with near correction - if worn
infrared
'test eye'
545 pm

9. Estimating the anterior chamber depth with a penlight works because...
a narrow angle and bowed iris cast a shadow on the iris
varies according to the type of test administered
reflex tears
refractive error

10. 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...
to the left of the scleral and orbital echoes
that the sound beam is directed to the optic disc and the measurement is incorrect
Allow the patient to adjust to the light level before reading the letters.
remove the instrument from use

11. Pachymetry readings are routinely taken prior to...
more males than females
is acceptable
tear filter papers
refractive surgery

12. The IOLMaster eliminates which of the following sources of error?
corneal endothelial drop-out
is acceptable
shortened axial length due to compression
that the sound beam is directed to the optic disc and the measurement is incorrect

13. Schirmer's test I is used to measure...
reflex tears
patient wearing spectacles
23 to 24 mm
infrared

14. When calculating intraocular lens (IOL) powers - one must enter...
Allow the patient to adjust to the light level before reading the letters.
desired postoperative refraction
are based on the same general equation
shortened axial length due to compression

15. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
patients who have had corneal refractive surgery
narrow angles may precipitate an angle-closure glaucoma attack
20
narrow beam

16. When performing the TBUT test - the observer is looking for...
before starting school
the appearance of dry spots
can often be cured if the causative factor is eliminated
for screening purposes - such as job applications

17. Hereditary color vision defects affect...
more males than females
reading disabilities
the cobalt blue filter
varies according to the type of test

18. Almost all of the formulas for calculating IOL power...
are based on the same general equation
the patient should be tested with near correction - if worn
the defect tends to remain stable over time
A Schirmer's test of 10 mm or more is considered normal.

19. If a biometry instrument fails to calibrate properly - one should...
remove the instrument from use
can often be cured if the causative factor is eliminated
severe dry eye
shine the light flatly from the side - in the plane of the iris

20. An A-Sean can he artificially shortened due to...
suspected acquired color defect
pressing on the globe too hard with the probe
reflex tears
3.0 D

21. Hereditary color vision defects usually affect...
remove the instrument from use
decrease in vision due to glare conditions
dacryocystitis
both eyes equally

22. Young children can be tested using the color plates by...
a tall - central spike with only one peak and smaller spikes on either site
having them trace the number/figure
dacryocystitis
a malingerer may invent a number - thus identifying him- or herself

23. Color vision testing is used to detect all of the following except...
differentiate between congenital or acquired color blindness
the defect tends to remain stable over time
the use of an anesthetic
the patient is shown a sample that is discernable to normal and abnormal alike

24. A color plate that shows no obvious number to normal and abnormal alike is useful because...
refractive error
the cobalt blue filter
a malingerer may invent a number - thus identifying him- or herself
narrow angles may precipitate an angle-closure glaucoma attack

25. When performing pachymetry prior to refractive surgery - it is generally best to begin...
corneal endothelial drop-out
with the central cornea
to the left of the scleral and orbital echoes
red-green

26. Before proceeding with the actual color plate test...
the patient is shown a sample that is discernable to normal and abnormal alike
shine the light flatly from the side - in the plane of the iris
corneal endothelial drop-out
0.3 mm

27. The average central thickness of the human cornea is...
more males than females
545 pm
23 to 24 mm
a narrow angle and bowed iris cast a shadow on the iris

28. Measuring corneal thickness via nonoptical pachymetry involves the use of...
20
ultrasound
for screening purposes - such as job applications
'test eye'

29. Which eye structure is responsible for color vision?
red - green - and blue
are based on the same general equation
rods
posterior subcapsular cataract

30. In evaluating an axial length scan - the retinal echo must be...
23 to 24 mm
dacryocystitis
20
to the left of the scleral and orbital echoes

31. It is important to estimate the anterior chamber depth prior to dilation because...
shine the light flatly from the side - in the plane of the iris
narrow angles may precipitate an angle-closure glaucoma attack
reading disabilities
varies according to the type of test

32. This is not evaluated using rose Bengal except...
narrow angles may precipitate an angle-closure glaucoma attack
corneal endothelial drop-out
ultrasound
posterior subcapsular cataract

33. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
narrow beam
normal tearing
3.0 D
the use of an anesthetic

34. In which of the following would glare testing be most appropriate?
posterior subcapsular cataract
the patient should be tested with near correction - if worn
having them trace the number/figure
a malingerer may invent a number - thus identifying him- or herself

35. One of the keys in accurate pachymetry is...
23 to 24 mm
holding the probe perpendicular to the corneal surface
20
the use of an anesthetic

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

37. Rose bengal is...
a staining agent
both eyes equally
expensive equipment
23 to 24 mm

38. The type of pachymetry used to evaluate a glaucoma suspect is...
suspected acquired color defect
remove the instrument from use
central corneal thickness
white to white corneal diameter

39. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
Allow the patient to adjust to the light level before reading the letters.
patient wearing spectacles
the cobalt blue filter
shine the light flatly from the side - in the plane of the iris

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

41. Illumination for the color plates test...
patients who have had corneal refractive surgery
varies according to the type of test administered
desired postoperative refraction
a narrow angle and bowed iris cast a shadow on the iris

42. 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)...
red-green
white to white corneal diameter
one-fourth
A-constant

43. When calculating IOL power - each of the following are necessary except...
reflex tears
20
white to white corneal diameter
'test eye'

44. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
is acceptable
23 to 24 mm
that the sound beam is directed to the optic disc and the measurement is incorrect
suspected acquired color defect

45. A patient with which of the following potential diagnoses would be tested with bengal?
desired postoperative refraction
severe dry eye
5 minutes
545 pm

46. When using color plates - a score indicates abnormal color vision...
refractive error
2 to 3 seconds
varies according to the type of test
a narrow angle and bowed iris cast a shadow on the iris

47. Laser interferometry uses which type of laser light?
the use of an anesthetic
with the central cornea
infrared
reflex tears

48. The axial length of an average adult eye is...
IOL power
to have little or no shadow
the defect tends to remain stable over time
23 to 24 mm

49. With the 1OLMaster - the ideal signal-to-noise ratio is...
545 pm
2.0 or more
to have little or no shadow
a tall - central spike with only one peak and smaller spikes on either site

50. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
the defect tends to remain stable over time
545 pm
A Schirmer's test of 10 mm or more is considered normal.
to have little or no shadow