U3 T2 visual perception Flashcards
define presbyopia
a condition that develops as the lens loses elasticity and causes difficulties in focusing on objects that are close
define floaters
clumps of matter that appear as small specks or spots in the central vision
define cataracts
cloudy spots in the lens that cause vision to become blurred when proteins in the lens breaks down
define glaucoma
a disease affecting the optic nerve that interferes with the transmission of peripheral visual info to the brain
de
define age-related macular degeneration
a build-up of grainy deposits in the centre of the retina causing deterioration of central vision
define inherited visual disorder
visual disorders passed down from parents to children due to genetic factors
define congenital visual disorders
visual disorders present at birth
define colour vision deficiency
a genetically inherited disorder affecting how people percieve colour
define retinis pigmentosa
a gentic degenerative disease affecting the retina
1. define
reception
stimulus energy is collected by the sense organ
deinfe 2.
transduction
stimulus energy is converted by the receptor cells into electrochemical nerve impulses
define 3.
transmisstion
receptor cells send the nerve impulses to the priary sesnory cortex where specialised receptor cells respond as the process of perception begins
deinfe 4.
selection
selecting important sensory info on which to focus attention from the millions of stimuli we recieve
define 5.
organisation
sensory info reaches the brain and is reorganised so we can make sense of it
