NATS 1870 Chapter Notes - Chapter 1: Visual Phototransduction, Ganglion Cell, Retina Horizontal Cell

• School: York University
• Department: Natural Science
• Course: NATS 1870
• Professor: Tatiana Ouvarova

Document Summary

Category a: detection of light: regulating amount of light entering. Iris will regulate amount of light entering the eye by reducing/increasing size of pupil: using different types of photoreceptors in different lighting conditions. Rods work in dim-lighting so they can"t detect all photons and throw away the excess. Cones work in bright lighting: throwing away excess photons. Rods become over-saturated so they can"t detect all photons coming in and throw away the excess. Cones can reset themselves fast enough after absorption to distinguish between the number of photons coming in.