How The Eye Works

Question 1

Are the two types of photoreceptors

Answer 1

Rods, cones

Question 2

What is the process of vision

Answer 2

Light rays are refracted and focused on the pupil as they enter through the cornea. Muscles in the iris contract or relax to control the amount of like passing through the pupil. Then behind the pupil is the lens, which refracts the light more so it is focused on the retina. Then the photoreceptors in the retina respond to the energy from the light and generate action potentials which are sent along the optic nerve to the brain for processing.

Question 3

What are rods

Answer 3

Light sensitive and can function in the dark.I have a low level of visual sharpness as many Rod cells share a connection to the optic nerve

Question 4

what are cones

Answer 4

Function at a much higher intensity than rods, and allows some species to see in colour as they contain photo pigments.Cones give a high level of visual sharpness as each cone has a single connection to the optic nerve