Visual perception Flashcards
Humans can see ____ to ____ on the electromagnetic spectrum
380 to 750. This is out visible light spectrum
Visual sensation begins with
light entering the eye and passing through the cornea, then the aqueous humour, pupil, lens and vitreous humour before striking the receptor cells located in the retina. Then goes through the optic nerve to the visual cortex.
The retina is
the part of the eye that makes sense of the image and contains the photoreceptor cells.
The optic nerve
sends neural impulses to the visual cortex
The aqueous humour is
made up of water, salts adn proteins. Helps it keep its shape.
Blind spot
small sport where the optic nerve is. You cannot see anything at the blind spot as there are no photoreceptor cells there.
Cilliary muscles
helps the lens to flatten and bulge in order to focus on distant and close objects.
Sclera
covers the eye and protects the cornea.
Vitreous humour
helps the eye keep its shape
Lens
flattens for focusing on distant objects and thickens for near objects
Cornea
protecting the structures inside the eye, contributing to the refractive power of the eye, and focusing light rays on the retina with minimum scatter and optical degradation.
Pupil
where light enters. Can expand and decrease depending on how much light there is.
Photoreceptors
are found in the retina. Convert light energy
Rods
interpret short light waves
are found around the retina NOT in the middle
approx. 100 million in each eye
stimulated by lower levels of light
responsible for black and white vision, peripheral vision, night vision
Cones
interpret longer light waves
approx 6.5 million in each eye
mainly found at the center of your retina
responsible for daylight vision, colour vision and visual acquity
