Quiz 4
All of the following should be considered during visual acuity testing:
Always present a line of letters rather than isolated letters to the patient Test vision with and without correction for comparison Observe patient during testing to prevent peeking around occluder
All of the following should be considered during visual acuity testing EXCEPT:
Exam eyes binocularly first
A magnifying glass is labeled 6x; this gives you a dioptric power of 30.00 diopters
False
Adults over 40 can read up close even with significant refractive errors because they have powerful accommodative ability.
False
All of the following regarding potential acuity are true EXCEPT:
Helps physician determine size and shape of cornea
All of the following regarding potential acuity are true:
Is an estimate of the acuity a patient may have in the presence of media opacities Measured using PAM Let's the physician know that retina is intact Important in determining what visual acuity will be after cataract surgery
Regarding pinhole testing all of the following are true:
Pinhole disk eliminates peripheral rays of light and improves contrast Generally improves a patient's vision to almost within normal limits if the patient has a refractive error Recorded as NI if patient's vision is not improved with pinhole. Will not improve a patient's vision if loss of vision is due to disease
If a patient sees 20/40, then a normal patient sees the 20/20 letter at 40 ft.
True
Which of the following statements regarding visual acuity is correct:
Visual acuity degrades considerably in the presence of bright light The faster one travels, the worse one's vision becomes Contrast sensitivity tests are presented as patterns of stripes of varying contrast and size Under conditions of bright light, maculopathies are slow to recover vision
Which of the following statements regarding visual acuity is correct:
Visual acuity is recorded in feet in the United States Distance light rays from an object 20 feet away are considered parallel Visual acuity is expressed as a fraction The recommended illumination on the wall chart is 10 to 30 ft. candles
If a patient sees the 20/400 letter at 8 feet from the chart, the visual acuity is recorded
8/400
A patient reads the 20/40 line correctly, but reads 2 out of 6 letters on the 20/30 line, how is this visual acuity recorded?
20/30+2
Regarding pinhole testing all of the following are true EXCEPT:
Must be performed on any patient whose best entering acuity is 20/30 or better
Which of the following statements regarding visual acuity is not correct:
Near visual acuity assessments are done at a distance of 20-25 inches away from the patient
Which of the following statements regarding visual acuity is incorrect:
The Snellen chart consists of letters that subtend 10 minutes of arc to the eye