Measuring Eye Movements (M1)

Question 1

What does photoelectric viewing (visagraph) use to detect light levels? 1. What does it track? 2. What is the resolution? 3

Answer 1

1. photocell
2. limbus
3. less than 5’

Question 2

Are video eye trackers continuous or non-continuous?

Answer 2

non-continuous

Question 3

What are the methods of measuring eye movements?

Answer 3

1. direct viewing
2. videocameras
3. photoelectric viewing (visagraph)
4. ENG or EOG
5. scleral search coil method

Question 4

Is the cornea or the retina more positive?

Answer 4

cornea

Question 5

What is used for measuring eye movements during direct viewing?

Answer 5

follow limbus or some other landmark

Question 6

What is an ENG or EOG most useful to measuring? 1. What is the resolution? 2

Answer 6

1. assessing large eye movements

2. no better than 1deg

Question 7

What is the light source for videocameras for the measuring of eye movements? 1. What is the resolution? 2

Answer 7

1. infrared light

2. 15 minutes of arc

Question 8

What is the best research method available for eye movement detection? 1. What is the negative about this method? 2

Answer 8

1. scleral search coil method

2. coil slips at large angles of gaze