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Prism 2 - NAO chp 2. Sub 6. Questions well answered to pass
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Prism 2 - NAO chp 2. Sub 6. Questions well answered to pass
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Prism 2 - NAO chp 2. Sub 6. Questionswell answered to pass
Prismatic effect can be described as: - correct answer ✔✔the visual discomfort which results when the
optical center of a lens is not positioned directly in line with the optical axis of the patients eye.
when the ciliary muscles are exerted beyond their ability to coordinate the 2 optical axes, what will
result? - correct answer ✔✔double vision/diplopia and/or discomfort will result.
if the power in the horizontal meridian is very low, a PD that is incorrect could: - correct answer ✔✔still
be optically acceptable for the patient and could meet the ANSI horizontal prism tolerance.
one of the first things that an optician must check before attempting to design new lenses is: - correct
answer ✔✔whether or not prismatic effect exists in the old lenses.
if you find out the patient has a prism in the old lenses, what should you do? - correct answer ✔✔-
communicate with the prescriber to find out if the prism is prescribed or if it is unwanted.
-if unwanted, talk with the prescribing doctor to decide if we should remove the prism, reduce the
prism, or leave unchanged.
-if the patient is uncomfortable with the presence of prism, then fixing it in the new lenses should bring
welcome relief.
true or false:
prism notation identifies the amount of the prism and the direction of the base of the prism in 360
degrees or a combination of ups, downs, ins, and outs. - correct answer ✔✔true
what is the complaint most of the time with unwanted horizontal prism? - correct answer ✔✔their eyes
pulling or eyestrain (after verifying the eyewear Rx checks out, the PD is correct, but the patient is still
having problems)
, if there is unwanted vertical prism (the same amount in both lenses) what is the most common
complaint? - correct answer ✔✔they may say if they simply move the eyewear up or down, the vision
improves.
if there is unwanted vertical prism (if the centers are unequal) what is the most common complaint? -
correct answer ✔✔double vision/diplopia
true or false:
a patient has fewer problems with unwanted horizontal prism than with unwanted vertical prism. -
correct answer ✔✔true
compound prism - correct answer ✔✔prism in more than 1 direction
when denoting compound prism, where is 0/360, 90, 180, and 270? - correct answer ✔✔- 0/360 is
always on the right side of the lens when you're looking at it on a patients face.
- 90 is at the tops of the lens.
- 180 is at the left side of the lens when you're looking at it on a patients face.
- 270 is at the bottom of the lens.
excessive base down complaints from patients can include: - correct answer ✔✔- the floor (horizontal)
seems concave
- standing in the bottom of a bowl
-vertical objects seem taller
- feels like walking uphill.
excessive base up complaints from patients can include: - correct answer ✔✔-floor (horizontal) seems
convex
-standing on top of a hill
-vertical objects seem shorter
-walking downhill
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