Photoreceptors of the Retina

Photoreceptors

Cells of the retina that detects light

What are the two main cells in Photoreceptors?

Rod & Cone Cells

Rod cells

more sensitive to light

allows vision in dim light (nighttime)

Cone cells 

operate best in bright light 

What does the cone cells enable?

high- acuity, color vision

Where does light enter the eye from?

Anterior Pole

Where does the light travel to?

Back of the eye (the retina)

What is the most posterior cells of the retina? 

Photoreceptors 

What do the cells of the retina signal anteriorly form?

the optic nerve

What does the pathway of the signal output travels?

In the opposite direction of the pathway of light

What do Rods & Cones both have?

Inner & outer segment 

Outer segments are the 

receptor regions 

What pigments is present in Rod & Cones?

Light-absorbing

Macula Lutea

contains mostly cones

Fovea Centralis

contains only cones & region of highest visual acuity 

Optic disc 

blind spot;

No optic nerves are present, but photoreceptors