Biology - Eye Test

-see black and white
-better at night
-edge of the retina

-see colour (red,green,blue)
-better at day
-centre of retina

Lens - used for accomodation, can be tall and thin or short and fat
retina - holds cones and rods, used to register images
blind spot - cant see anything there
optic nerve - all the veins leave to the spinal chord via this

Radial muscles relax
circular contract

Radial muscles contract
circular relax