Physiology of vision

Question 1

Which cells are involved in the pathway of vision?

Answer 1

Photoreceptors
Bipolar cells
Ganglion cells

With Horiontal and Amacrine cells in between

Question 2

What do horizontal cells do?

Answer 2

Receive inpur from photoreceptors and project to other photoreceptors and bipolar cells

Question 3

What do amacrine cells do?

Answer 3

Receive input from bipolar cells and project to ganglion cells, bipolar cells and other amacrine cells

Question 4

Basis of phototransduction?

Answer 4

Photoreceptors have a depolarised rmp

Light exposure causes hyperpolarisation

Question 5

What is visual acuity?

Answer 5

Ability to distinguish two nearby points

Question 6

What is receptive field?

Answer 6

The part of the retina that needs to be stimulated to elicit action potentials from a ganglion cell

Question 7

What are the four different photoreceptor types in the human retina?

Answer 7

Short wave- Blue
Medium wave- green
Long wave- red
Rods

Question 8

features of rods

Answer 8

Peripheral retina
High convergence
High light sensitivity
Low visual acuity

Question 9

Features of cones?

Answer 9

Central retina
Low convergence
Low light sensitivity
High visual acuity