Skip to main content

Test yourself: 5 hard theory questions, free

Free test
easyvisual-system

Night vision primarily uses:

A

rod cells in the peripheral retina

B

cone cells in the fovea

C

the optic nerve only

D

colour-sensitive cells

Checking member access

One moment while we confirm your plan so paid members never see checkout by mistake.

Checking member access before showing upgrade options

Keep practising

See where you stand: 5 hard questions, instant score, every answer explained.