3. Ibn Sahl 984
Laws of refraction

4. Ibn al-Haytham (Alhazen)
Book of optics
Ray theories of light
Human Visual System

5. Visual Attention & Visual Perception
Sight and Seeing
Cognition and Eye Movement (saccade)
Top-down
cognition
Memory
Priming
Knowledge
Bottom-up
Stimulus
feature processing
pattern recognition

12. Bracketed Perception vs. Normal Perception
A bounded visual space, oval, approximately 180° laterally, 150° vertically
Clarity of focus at only one point with a gradient of increasing vagueness toward the margin
Parallel lines appear to converge
If the head is moved, the shapes of objects appear to be deformed
The visual space appears to lack depth
A world of patterns and sensation, of surfaces, edges and gradients
 Unbounded visual space
Clarity of focus throughout
Parallel lines extend without converging
If the head is moved, shapes remain constant
Visual space is never wholly depthless
A world of familiar objects and meaning