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. 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?
0.3 mm
varies according to the type of test
shine the light flatly from the side - in the plane of the iris
one-fourth

2. Schirmer's test does not require _____ except Test strips
expensive equipment
are based on the same general equation
to have little or no shadow
the patient should be tested with near correction - if worn

3. Measuring corneal thickness via nonoptical pachymetry involves the use of...
ultrasound
expensive equipment
white to white corneal diameter
dacryocystitis

4. How long should the patient be given to recognize the figure in a color plate?
2 to 3 seconds
A Schirmer's test of 10 mm or more is considered normal.
expensive equipment
tear filter papers

5. Measuring time for the Schirmer's test is...
that the sound beam is directed to the optic disc and the measurement is incorrect
5 minutes
shortened axial length due to compression
expensive equipment

6. Estimating the anterior chamber depth with a penlight works because...
545 pm
2 to 3 seconds
blink
a narrow angle and bowed iris cast a shadow on the iris

7. Color vision testing is used to detect all of the following except...
differentiate between congenital or acquired color blindness
red-green
Allow the patient to adjust to the light level before reading the letters.
to have little or no shadow

8. Schirmer's test II is used to measure...
one-fourth
Allow the patient to adjust to the light level before reading the letters.
normal tearing
shine the light flatly from the side - in the plane of the iris

9. When should a child have his or her color vision checked?
before starting school
that the sound beam is directed to the optic disc and the measurement is incorrect
red-green
rods

10. Before proceeding with the actual color plate test...
more males than females
white to white corneal diameter
focus can he moved off-axis to obtain a clear reading
the patient is shown a sample that is discernable to normal and abnormal alike

11. When calculating IOL power - each of the following are necessary except...
varies according to the type of test
one-fourth
more males than females
white to white corneal diameter

12. The photosensitive pigments of the eye are sensitive to...
focus can he moved off-axis to obtain a clear reading
red - green - and blue
shortened axial length due to compression
severe dry eye

13. Just prior to the beginning of the TBUT test - the patient is instructed to...
varies according to the type of test administered
blink
differentiate between congenital or acquired color blindness
decrease in vision due to glare conditions

14. When performing pachymetry prior to refractive surgery - it is generally best to begin...
reflex tears
patients who have had corneal refractive surgery
posterior subcapsular cataract
with the central cornea

15. If a biometry instrument fails to calibrate properly - one should...
A Schirmer's test of 10 mm or more is considered normal.
remove the instrument from use
before starting school
ultrasound

16. The IOLMaster eliminates which of the following sources of error?
shortened axial length due to compression
before starting school
the patient is shown a sample that is discernable to normal and abnormal alike
expensive equipment

17. The axial length of the eye is important in the calculation of...
that the sound beam is directed to the optic disc and the measurement is incorrect
IOL power
dacryocystitis
expensive equipment

18. Which of the following should be color-vision tested one eye at a time?
suspected acquired color defect
normal tearing
3.0 D
varies according to the type of test

19. When positioning the IOLMaster for the axial length reading...
focus can he moved off-axis to obtain a clear reading
the patient should be tested with near correction - if worn
is acceptable
to have little or no shadow

20. When calculating intraocular lens (IOL) powers - one must enter...
desired postoperative refraction
to have little or no shadow
normal tearing
focus can he moved off-axis to obtain a clear reading

21. A TBUT of which of the following would indicate tear film dysfunction?
'test eye'
10 seconds
expensive equipment
corneal endothelial drop-out

22. Rose bengal is...
a staining agent
a tall - central spike with only one peak and smaller spikes on either site
0.3 mm
dacryocystitis

23. 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
ultrasound
differentiate between congenital or acquired color blindness
remove the instrument from use

24. In test a patient with the color pseudoisochromatic plates...
the patient should be tested with near correction - if worn
23 to 24 mm
can often be cured if the causative factor is eliminated
3.0 D

25. 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
normal tearing
with the central cornea
expensive equipment

26. This is not evaluated using rose Bengal except...
can often be cured if the causative factor is eliminated
2.0 or more
central corneal thickness
corneal endothelial drop-out

27. 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)...
A-constant
blink
expensive equipment
Allow the patient to adjust to the light level before reading the letters.

28. When performing the TBUT test - the observer is looking for...
rods
before starting school
Allow the patient to adjust to the light level before reading the letters.
the appearance of dry spots

29. For safety reasons - the limit for the number of readings that may he taken per eye per day with the 101.Master is...
narrow angles may precipitate an angle-closure glaucoma attack
before starting school
refractive surgery
20

30. Pachymetry readings are routinely taken prior to...
remove the instrument from use
shine the light flatly from the side - in the plane of the iris
refractive surgery
desired postoperative refraction

31. It is important to estimate the anterior chamber depth prior to dilation because...
dacryocystitis
before starting school
severe dry eye
narrow angles may precipitate an angle-closure glaucoma attack

32. Young children can be tested using the color plates by...
having them trace the number/figure
the use of an anesthetic
545 pm
for screening purposes - such as job applications

33. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
varies according to the type of test administered
can often be cured if the causative factor is eliminated
desired postoperative refraction
3.0 D

34. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
the patient is shown a sample that is discernable to normal and abnormal alike
the use of an anesthetic
can often be cured if the causative factor is eliminated
the defect tends to remain stable over time

35. In evaluating an axial length scan - the retinal echo must be...
545 pm
to the left of the scleral and orbital echoes
a tall - central spike with only one peak and smaller spikes on either site
white to white corneal diameter

36. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
a narrow angle and bowed iris cast a shadow on the iris
more males than females
shine the light flatly from the side - in the plane of the iris
reflex tears

37. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
'test eye'
A Schirmer's test of 10 mm or more is considered normal.
patients who have had corneal refractive surgery
the patient is shown a sample that is discernable to normal and abnormal alike

38. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
narrow beam
white to white corneal diameter
central corneal thickness
for screening purposes - such as job applications

39. Color vision defects in children are frequently detected among those with...
are based on the same general equation
reading disabilities
rods
desired postoperative refraction

40. When performing a brightness acuity glare test - it is best to do which of the following?
one-fourth
Allow the patient to adjust to the light level before reading the letters.
having them trace the number/figure
10 seconds

41. In which of the following would glare testing be most appropriate?
IOL power
refractive surgery
refractive error
posterior subcapsular cataract

42. The Schirmer's test might be indicated in all of the following except...
dacryocystitis
infrared
the use of an anesthetic
to the left of the scleral and orbital echoes

43. Schirmer's test I is used to measure...
narrow angles may precipitate an angle-closure glaucoma attack
patients who have had corneal refractive surgery
reflex tears
the use of an anesthetic

44. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
'test eye'
5 minutes
narrow angles may precipitate an angle-closure glaucoma attack
is acceptable

45. Hereditary color vision defects usually affect...
pressing on the globe too hard with the probe
both eyes equally
a tall - central spike with only one peak and smaller spikes on either site
focus can he moved off-axis to obtain a clear reading

46. Laser interferometry uses which type of laser light?
infrared
tear filter papers
0.3 mm
the patient is shown a sample that is discernable to normal and abnormal alike

47. The IOLMaster evaluates each of the following except...
reflex tears
3.0 D
patient wearing spectacles
refractive error

48. Acquired color vision defects...
'test eye'
can often be cured if the causative factor is eliminated
suspected acquired color defect
shortened axial length due to compression

49. A patient with which of the following potential diagnoses would be tested with bengal?
severe dry eye
are based on the same general equation
can often be cured if the causative factor is eliminated
reading disabilities

50. When using a penlight to estimate anterior chamber depth - an open angle would appear...
shortened axial length due to compression
to have little or no shadow
holding the probe perpendicular to the corneal surface
A Schirmer's test of 10 mm or more is considered normal.