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Test your basic knowledge |
Certified Ophthalmic Assistant
Start Test
Study First
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. Which of the following poses problems in obtaining accurate measurements for IOL calculations?
a staining agent
red-green
refractive surgery
patients who have had corneal refractive surgery
2. Almost all of the formulas for calculating IOL power...
are based on the same general equation
focus can he moved off-axis to obtain a clear reading
20
is acceptable
3. The axial length of an average adult eye is...
posterior subcapsular cataract
the appearance of dry spots
23 to 24 mm
desired postoperative refraction
4. When should a child have his or her color vision checked?
before starting school
narrow angles may precipitate an angle-closure glaucoma attack
the defect tends to remain stable over time
3.0 D
5. 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?
varies according to the type of test
pressing on the globe too hard with the probe
0.3 mm
severe dry eye
6. When using color plates - a score indicates abnormal color vision...
varies according to the type of test
can often be cured if the causative factor is eliminated
dacryocystitis
varies according to the type of test administered
7. Schirmer's test does not require _____ except Test strips
varies according to the type of test administered
expensive equipment
severe dry eye
the patient is shown a sample that is discernable to normal and abnormal alike
8. The IOLMaster evaluates each of the following except...
one-fourth
IOL power
refractive error
shine the light flatly from the side - in the plane of the iris
9. When using a penlight to estimate the depth of the anterior chamber - the following technique is best...
varies according to the type of test
white to white corneal diameter
Allow the patient to adjust to the light level before reading the letters.
shine the light flatly from the side - in the plane of the iris
10. Measuring time for the Schirmer's test is...
5 minutes
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
central corneal thickness
11. Which of the following should be color-vision tested one eye at a time?
suspected acquired color defect
normal tearing
10 seconds
5 minutes
12. When positioning the IOLMaster for the axial length reading...
reflex tears
focus can he moved off-axis to obtain a clear reading
corneal endothelial drop-out
shortened axial length due to compression
13. 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 staining agent
A-constant
for screening purposes - such as job applications
refractive error
14. When using a penlight to estimate anterior chamber depth - an open angle would appear...
narrow beam
decrease in vision due to glare conditions
a staining agent
to have little or no shadow
15. Each of the following can cause an error in the axial length scan reading of the IOL Master except...
A Schirmer's test of 10 mm or more is considered normal.
shortened axial length due to compression
23 to 24 mm
patient wearing spectacles
16. When calculating intraocular lens (IOL) powers - one must enter...
5 minutes
desired postoperative refraction
for screening purposes - such as job applications
suspected acquired color defect
17. In evaluating an axial length scan - the retinal echo must be...
to the left of the scleral and orbital echoes
narrow angles may precipitate an angle-closure glaucoma attack
dacryocystitis
the patient should be tested with near correction - if worn
18. 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
with the central cornea
reading disabilities
corneal endothelial drop-out
19. 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?
5 minutes
one-fourth
the use of an anesthetic
the patient is shown a sample that is discernable to normal and abnormal alike
20. In test a patient with the color pseudoisochromatic plates...
the patient should be tested with near correction - if worn
holding the probe perpendicular to the corneal surface
differentiate between congenital or acquired color blindness
is acceptable
21. _______ are not used in evaluating tear break-up time (TBUT)
for screening purposes - such as job applications
refractive surgery
more males than females
tear filter papers
22. 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
pressing on the globe too hard with the probe
desired postoperative refraction
reading disabilities
23. Before proceeding with the actual color plate test...
a tall - central spike with only one peak and smaller spikes on either site
the patient is shown a sample that is discernable to normal and abnormal alike
both eyes equally
central corneal thickness
24. It is important to estimate the anterior chamber depth prior to dilation because...
can often be cured if the causative factor is eliminated
to the left of the scleral and orbital echoes
narrow angles may precipitate an angle-closure glaucoma attack
refractive surgery
25. The difference between Schirmer's test I and II is...
focus can he moved off-axis to obtain a clear reading
the use of an anesthetic
to have little or no shadow
reading disabilities
26. When evaluating anterior chamber depth with the slit lump - the illumination technique used is...
narrow beam
2 to 3 seconds
remove the instrument from use
more males than females
27. The Ishihara color plates are useful...
for screening purposes - such as job applications
IOL power
to the left of the scleral and orbital echoes
decrease in vision due to glare conditions
28. The photosensitive pigments of the eye are sensitive to...
a tall - central spike with only one peak and smaller spikes on either site
the patient is shown a sample that is discernable to normal and abnormal alike
a staining agent
red - green - and blue
29. Hereditary color defects most often fall into which category?
are based on the same general equation
red-green
the appearance of dry spots
central corneal thickness
30. A TBUT of which of the following would indicate tear film dysfunction?
both eyes equally
10 seconds
A-constant
is acceptable
31. When performing the TBUT test - the observer is looking for...
to have little or no shadow
the appearance of dry spots
is acceptable
patients who have had corneal refractive surgery
32. The Schirmer's test might be indicated in all of the following except...
dacryocystitis
severe dry eye
tear filter papers
2 to 3 seconds
33. The type of pachymetry used to evaluate a glaucoma suspect is...
central corneal thickness
infrared
a staining agent
A-constant
34. When calculating IOL power - each of the following are necessary except...
the patient is shown a sample that is discernable to normal and abnormal alike
decrease in vision due to glare conditions
white to white corneal diameter
'test eye'
35. Illumination for the color plates test...
differentiate between congenital or acquired color blindness
the patient should be tested with near correction - if worn
suspected acquired color defect
varies according to the type of test administered
36. Which eye structure is responsible for color vision?
rods
'test eye'
patients who have had corneal refractive surgery
2.0 or more
37. In which of the following would glare testing be most appropriate?
infrared
'test eye'
posterior subcapsular cataract
a tall - central spike with only one peak and smaller spikes on either site
38. A rose bengal does not require the use of...
shine the light flatly from the side - in the plane of the iris
severe dry eye
the cobalt blue filter
to have little or no shadow
39. The ideal IOLMaster axial length graph is...
remove the instrument from use
to the left of the scleral and orbital echoes
a tall - central spike with only one peak and smaller spikes on either site
are based on the same general equation
40. Color vision testing is used to detect all of the following except...
a staining agent
5 minutes
patients who have had corneal refractive surgery
differentiate between congenital or acquired color blindness
41. Laser interferometry uses which type of laser light?
having them trace the number/figure
ultrasound
blink
infrared
42. Schirmer's test I is used to measure...
for screening purposes - such as job applications
10 seconds
5 minutes
reflex tears
43. An A-Sean can he artificially shortened due to...
pressing on the globe too hard with the probe
central corneal thickness
a narrow angle and bowed iris cast a shadow on the iris
IOL power
44. Schirmer's test II is used to measure...
severe dry eye
can often be cured if the causative factor is eliminated
infrared
normal tearing
45. If a biometry instrument fails to calibrate properly - one should...
severe dry eye
the appearance of dry spots
remove the instrument from use
pressing on the globe too hard with the probe
46. 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
differentiate between congenital or acquired color blindness
'test eye'
the use of an anesthetic
47. How long should the patient be given to recognize the figure in a color plate?
2 to 3 seconds
5 minutes
the defect tends to remain stable over time
23 to 24 mm
48. A patient with which of the following potential diagnoses would be tested with bengal?
white to white corneal diameter
a narrow angle and bowed iris cast a shadow on the iris
the cobalt blue filter
severe dry eye
49. Acquired color vision defects...
reflex tears
23 to 24 mm
can often be cured if the causative factor is eliminated
having them trace the number/figure
50. The axial length of the eye is important in the calculation of...
before starting school
is acceptable
refractive surgery
IOL power