Presentation on theme: "The eye – curved cornea – lens – retina – fovea – optic disk Using Light."— Presentation transcript:
The eye – curved cornea – lens – retina – fovea – optic disk Using Light
photoreceptors transduce incoming light ganglion cells send signals along to the brain The Retina has layers of cells
2 types of photoreceptors: rods and cones rods are very sensitive - useful in dim light Two kinds of Photoreceptors
Rods and cones are distributed differently across the retina The Retina
visual acuity (ability to see detail) depends on cones - thus acuity varies across the visual field The Retina
Why don’t you notice your blind spot? The Retina
Why don’t you notice your blind spot? – Blindspots don’t overlap! – Your brain “fills in” the missing information – The specific information in the blindspot isn’t much more missing than the rest of the periphery! The Retina
three types of cones: short, medium, and long different absorptions enable color vision The Retina
Ganglion cells project to the brain via the optic nerve information is projected to contralateral cortex! Visual Pathways
Seeing Depth What’s the big problem with seeing depth ?
Seeing Depth The world is 3D, the retina is 2D !