PSYC 212 Lecture Notes - Lecture 6: Scotopic Vision, Mesopic Vision, Purkinje Effect

• School: McGill University
• Department: Psychology
• Course: PSYC 212
• Professor: Remy Allard

Document Summary

When rays pass from high index to low index rays are deviated further from the normal. When rays pass form low index to high index rays deviate towards the normal. Rays are so far away that the pupil are pretty much parallel. In the sunlight: photopic sun"s surface absolute threshold (cones, sensory latyer and the most internal. Most densely packed = 20o from the fovea with 150 000 rods/mm2 (where we focus our information to read) Can"t see a very dim, small object if foveally fixated under scotopic conditions: cones (6 million) Fovea = blind but where everything focuses. Most densely packed in the fovea with 150 000 cones/mm2. Only 4% of all cones are not foveal. No s-cones in the fovea: eyes give the impression that we see everything clearly but in fact our eyes move all the time, optic disc where all of the action of the ganglian cell gets together.