11. Prisms Flashcards Preview

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Flashcards in 11. Prisms Deck (15):
1

What is Prentice prism position?

Light enters at 90 degrees
Flat part of the prism sits parallel to the eye
All deviation occurs at the exit surface

2

What is the spatial volume effect of BD prisms?

Shifts spatial volume up and out
Increases visual spatial volume

3

What is the effect of BU prisms?

Shifts spatial volume down and in
Decreases visual spatial volume

4

What effect does BI prism have on visual space?

Displaces visual outward
Increases visual space

5

What does BI prism do to the muscle tone of the neck and upper back?

Reduces it

6

Which prism enhances figure?

BO

7

Which prism enhances ground?

BI

8

What is the spatial effect of BO prism?

Displaces visual outward
Decreases visual space

9

What does BO prism do the the muscle tone of the neck and upper back?

Increases it

10

What are the volume changes of a prism in relation to the apex and base?

Expansion = apex
Contraction = base

11

Prisms affect which 4 systems?

Visual
Kinesthetic
Vestibular
Proprioceptive

12

What prism do you give for an anterior midline shift?

Base down (opens things up)

13

What prism do you give for a posterior midline shift?

Base up

14

What prism do you give for a left midline shift?

Base right

15

What prism do you give for a right midline shift?

Base left