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Prism 2 - NAO chp 2. sub 6 Questions And Answers With Verified Solutions | Latest Update 2025
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Prism 2 - NAO chp 2. sub 6 Questions And Answers With Verified Solutions | Latest Update 2025
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Prism 2 - NAO chp 2. sub 6 Questions AndAnswers With Verified Solutions | Latest
Update 2025
Prismatic effect can be described as: - 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? - 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: -
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: - 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? -
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. -
ANSWER true
what is the complaint most of the time with unwanted horizontal prism? -
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? - 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? - ANSWER double vision/diplopia
true or false:
a patient has fewer problems with unwanted horizontal prism than with
unwanted vertical prism. - ANSWER true
compound prism - ANSWER prism in more than 1 direction
when denoting compound prism, where is 0/360, 90, 180, and 270? - 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.
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