vision Flashcards
colour blindness: explain the most common forms of colour blindness
wavelength of blue light and photoreceptor
430nm, S cones
wavelength of green light and photoreceptor
540nm, M cones
wavelength of red light and photoreceptor
570nm, L cones
wavelength of rods; significance of overlap of different cone wavelengths
largest section: 400-600nm; as overlap, colour blindness can occur
most common colour vision deficiency
deuteranmolay (red-green confusion)
what does the ishihara (colour perception test) test for
red-green deficiencies
what is the ishihara test
red and green dots with 2-digit number
what happens in dark adaption; length of time cones and rods take to adapt
biphasic process to increase in light sensitivity in dark; cone takes 7 minutes, rods take 30 minutes as regeneration of rhodopsin
what happens in light adaption and duration
neuro-adaption from dark to light by bleaching of photo-pigments and inhibition of rod/cone function; occurs over 5 minutes
what is pupil adaption in light dark adaption
minor where pupil constricts with light
