Stereo Distortions (F)

Question 1

If an overall magnifier is held over the right eye, what are the lines on the eikonometer target that are magnified/altered?

Answer 1

vertical lines only

Question 2

If a axis 90 magnifier (3% R X 90) is held over the right eye, what are the lines on the eikonometer target that are magnified/altered?

Answer 2

vertical lines and cross

Question 3

What are the cyclotorsional eye movements that compensate for inclinations of objects relative to the head?

Answer 3

disjunctive (cyclofusional)

Question 4

How does the OFPP (ex: back wall of leaf room) appear with base out prism? 1. Why? 2

Answer 4

1. concave and distant

2. magnification increases toward prism apex

Question 5

What is the law that states perceived size varies directly as perceived distance (ex: may be same size on retina but perceived as larger because brain says it is further away)?

Answer 5

Emmert’s Law

Question 6

If a axis 180 magnifier (3% R X 180) is held over the right eye, what are the lines on the eikonometer target that are magnified/altered?

Answer 6

cross only (direction opposite of axis 90)

Question 7

How does the OFPP (ex: back wall of leaf room) appear with base in prism? 1. Why? 2

Answer 7

1. convex near

2. magnification increases toward prism apex

Question 8

What are the distortions of images made by prisms?

Answer 8

1. asymmetric magnification (base-apical mag): inc toward apex
2. curvature of lines perpendicular to base-apex
3. rotation of lines parallel to base-apex
4. overal magnification

Question 9

If magnification distorts stereoscopic distance, then perceived size changes in accordance to what?

Answer 9

Emmert’s Law

Question 10

If a axis 90 magnifier (3% R X 90) is held over the right eye what will the appearance of the back wall of the leaf room be?

Answer 10

right side appears larger and further away than left side

Question 11

What is the effect of an overall magnifier over one eye on the leaf room? 1. Why? 2

Answer 11

1. no distortion

2. vertical disparities somehow negate effects of lateral disparities

Question 12

What is the induced effect of an overall magnifier? 1. What is it limited to? 2

Answer 12

1. vertical disparities cause an overall global size change (like a zoom on camera)
2. about 4% with larger disparities having an incomplete induced effect

Question 13

What are the type of magnifiers available to use in the eikonometer?

Answer 13

1. x90
2. overall
3. x180
4. oblique

Question 14

What are the cyclotorsional eye movements that compensate for tilts of the head or body?

Answer 14

conjugate

Question 15

What does an excyclofusional movement while looking at an eikonometer with R X 45 and L X 135 glasses provide?

Answer 15

makes vertical lines straight and alters cross lines so that they appear either have the bottom or top coming towards or away from the viewer based upon whether the images became crossed or uncrossed

Question 16

If a horizontal magnifier is placed in front of one eye, what must the eye with the magnifier in front of it do to compensate? 1. What do these magnifiers distort? 2

Answer 16

1. must make beta angles smaller

2. distance and size

Question 17

If oblique magnification is held over the eyes, what are the lines on the eikonometer target that are magnified/altered?

Answer 17

cross only (direction is opposite leaf room

Question 18

If a axis 45 magnifier (3% R X 45) is held over the right eye what will the appearance of the back wall of the leaf room be?

Answer 18

top side appears larger and further away than the bottom

Question 19

What are the apparatuses for the study of stereoscopic perception of space?

Answer 19

1. leaf room
2. tilting plane
3. eikonometer target

Question 20

What type of cyclotorsional eye movements influence stereoscopic distortions?

Answer 20

disjunctive (cyclofusional)

Question 21

What is a device used to quantify stereoscopic spatial distortions? 1. What are the instructions for its use? 2

Answer 21

1. The tilting plane apparatus

2. subject rotates target plane to appear fronto-parallel

Question 22

Does the eikonometer produce an induced effect?

Answer 22

no

Question 23

If a axis 180 magnifier (3% R X 180) is held over the right eye what will the appearance of the back wall of the leaf room be?

Answer 23

left side appears larger and further away than right side

Question 24

How are vertical contours altered with prism?

Answer 24

bowed with middle towards base

Question 25

What is the effect of an oblique magnifier on a vertical line?

Answer 25

lines rotated toward magnification meridian

Question 26

What magnification effects can the leaf room be good for displaying?

Answer 26

1. horizontal
2. overall
3. vertical
4. oblique
5. prism

Question 27

If a axis 135 magnifier (3% R X 135) is held over the right eye what will the appearance of the back wall of the leaf room be?

Answer 27

bottom side appears larger and further away than the top