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. Almost all of the formulas for calculating IOL power...
more males than females
are based on the same general equation
to the left of the scleral and orbital echoes
the cobalt blue filter

2. Pachymetry readings are routinely taken prior to...
is acceptable
refractive surgery
differentiate between congenital or acquired color blindness
2 to 3 seconds

3. The axial length of an average adult eye is...
23 to 24 mm
red - green - and blue
remove the instrument from use
to the left of the scleral and orbital echoes

4. When should a child have his or her color vision checked?
3.0 D
IOL power
holding the probe perpendicular to the corneal surface
before starting school

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

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

7. When performing pachymetry prior to refractive surgery - it is generally best to begin...
narrow angles may precipitate an angle-closure glaucoma attack
severe dry eye
shine the light flatly from the side - in the plane of the iris
with the central cornea

8. The difference between Schirmer's test I and II is...
the use of an anesthetic
can often be cured if the causative factor is eliminated
a malingerer may invent a number - thus identifying him- or herself
A Schirmer's test of 10 mm or more is considered normal.

9. Illumination for the color plates test...
reading disabilities
blink
varies according to the type of test administered
differentiate between congenital or acquired color blindness

10. A TBUT of which of the following would indicate tear film dysfunction?
10 seconds
central corneal thickness
posterior subcapsular cataract
pressing on the globe too hard with the probe

11. Glare testing is used to identify...
focus can he moved off-axis to obtain a clear reading
normal tearing
refractive surgery
decrease in vision due to glare conditions

12. An A-Sean can he artificially shortened due to...
focus can he moved off-axis to obtain a clear reading
pressing on the globe too hard with the probe
ultrasound
can often be cured if the causative factor is eliminated

13. You are inputting data for IOL calculations and notice that the K readings 44.5/42.75. This type of reading...
patient wearing spectacles
varies according to the type of test
545 pm
is acceptable

14. Measuring corneal thickness via nonoptical pachymetry involves the use of...
ultrasound
A Schirmer's test of 10 mm or more is considered normal.
patients who have had corneal refractive surgery
'test eye'

15. Before proceeding with the actual color plate test...
severe dry eye
white to white corneal diameter
the patient is shown a sample that is discernable to normal and abnormal alike
desired postoperative refraction

16. A measurement error of 1 mm in an axial eye length could result in an unwanted postoperative refractive error of as much as...
3.0 D
severe dry eye
'test eye'
2 to 3 seconds

17. Acquired color vision defects...
can often be cured if the causative factor is eliminated
desired postoperative refraction
with the central cornea
holding the probe perpendicular to the corneal surface

18. Just prior to the beginning of the TBUT test - the patient is instructed to...
0.3 mm
patient wearing spectacles
blink
with the central cornea

19. When calculating IOL power - each of the following are necessary except...
severe dry eye
desired postoperative refraction
'test eye'
white to white corneal diameter

20. The type of pachymetry used to evaluate a glaucoma suspect is...
central corneal thickness
a malingerer may invent a number - thus identifying him- or herself
desired postoperative refraction
before starting school

21. When using color plates - a score indicates abnormal color vision...
the appearance of dry spots
reflex tears
varies according to the type of test
for screening purposes - such as job applications

22. 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?
desired postoperative refraction
narrow beam
one-fourth
the cobalt blue filter

23. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
A-constant
is acceptable
the patient is shown a sample that is discernable to normal and abnormal alike
patients who have had corneal refractive surgery

24. It is important to estimate the anterior chamber depth prior to dilation because...
dacryocystitis
narrow angles may precipitate an angle-closure glaucoma attack
the defect tends to remain stable over time
patients who have had corneal refractive surgery

25. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
differentiate between congenital or acquired color blindness
the cobalt blue filter
shine the light flatly from the side - in the plane of the iris
narrow beam

26. The Schirmer's test might be indicated in all of the following except...
dacryocystitis
one-fourth
0.3 mm
a staining agent

27. When performing a brightness acuity glare test - it is best to do which of the following?
holding the probe perpendicular to the corneal surface
normal tearing
Allow the patient to adjust to the light level before reading the letters.
5 minutes

28. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
patient wearing spectacles
2 to 3 seconds
having them trace the number/figure
the patient should be tested with near correction - if worn

29. The axial length of the eye is important in the calculation of...
rods
a tall - central spike with only one peak and smaller spikes on either site
patients who have had corneal refractive surgery
IOL power

30. 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
0.3 mm
blink
infrared

31. The Ishihara color plates are useful...
remove the instrument from use
the cobalt blue filter
for screening purposes - such as job applications
to the left of the scleral and orbital echoes

32. In evaluating an axial length scan - the retinal echo must be...
that the sound beam is directed to the optic disc and the measurement is incorrect
the patient is shown a sample that is discernable to normal and abnormal alike
to the left of the scleral and orbital echoes
varies according to the type of test

33. How long should the patient be given to recognize the figure in a color plate?
corneal endothelial drop-out
one-fourth
2 to 3 seconds
posterior subcapsular cataract

34. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
varies according to the type of test
the patient is shown a sample that is discernable to normal and abnormal alike
patient wearing spectacles
narrow beam

35. Hereditary color vision defects usually affect...
shortened axial length due to compression
a staining agent
both eyes equally
3.0 D

36. If a biometry instrument fails to calibrate properly - one should...
remove the instrument from use
IOL power
the patient should be tested with near correction - if worn
pressing on the globe too hard with the probe

37. When positioning the IOLMaster for the axial length reading...
rods
decrease in vision due to glare conditions
tear filter papers
focus can he moved off-axis to obtain a clear reading

38. In test a patient with the color pseudoisochromatic plates...
desired postoperative refraction
to have little or no shadow
narrow angles may precipitate an angle-closure glaucoma attack
the patient should be tested with near correction - if worn

39. The IOLMaster evaluates each of the following except...
545 pm
A Schirmer's test of 10 mm or more is considered normal.
decrease in vision due to glare conditions
refractive error

40. Which of the following should be color-vision tested one eye at a time?
varies according to the type of test administered
suspected acquired color defect
a staining agent
narrow beam

41. The photosensitive pigments of the eye are sensitive to...
normal tearing
central corneal thickness
red - green - and blue
ultrasound

42. _______ are not used in evaluating tear break-up time (TBUT)
for screening purposes - such as job applications
a narrow angle and bowed iris cast a shadow on the iris
red - green - and blue
tear filter papers

43. In which of the following would glare testing be most appropriate?
varies according to the type of test administered
dacryocystitis
posterior subcapsular cataract
A Schirmer's test of 10 mm or more is considered normal.

44. If the patient is suspected of having an acquired color vision defect - all of the following apply except...
corneal endothelial drop-out
the defect tends to remain stable over time
with the central cornea
refractive error

45. When performing the TBUT test - the observer is looking for...
the appearance of dry spots
patients who have had corneal refractive surgery
before starting school
expensive equipment

46. When calculating intraocular lens (IOL) powers - one must enter...
IOL power
differentiate between congenital or acquired color blindness
narrow angles may precipitate an angle-closure glaucoma attack
desired postoperative refraction

47. A color plate that shows no obvious number to normal and abnormal alike is useful because...
a staining agent
red - green - and blue
a malingerer may invent a number - thus identifying him- or herself
one-fourth

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

49. Schirmer's test does not require _____ except Test strips
expensive equipment
dacryocystitis
corneal endothelial drop-out
posterior subcapsular cataract

50. Schirmer's test I is used to measure...
reflex tears
varies according to the type of test administered
expensive equipment
both eyes equally