1. Properties of light and visual function Flashcards
optical radiation
lies between x-rays and mircowaves
how many subdivisions
seven
UVC, UVB, UVA, visible , IRA, IRB, IRC
wavelength for uvc
200-280nm
wavelength for uvb
280-315nm
wavelength for UVA
315-400nm
wavelength for visible
400-780nm
wavelength for IRA
780 - 1400
wavelength for IRB
1400-3000NM
wavelength for IRC
3000-10,000nm
shorter wavelength
greater energy
cornea and sclera absorb
very short UVB and UVC
very long IRB IRC
crystalline lens absorbs
UVA
what passes through
visible light and IRA
400 - 1,400nm
white loght
mixture of all visible light
colour and cone
Short = blue
Middle = green
Long = red
Blue, green and red wavelength length
blue 440
green 535
red 560
Green colour blind
deuteranopia
red colour blind
protanopia
blue colour blind
tritanopia
Clinical testing of colour vision
Farnsworth-Munsell FM hue 100
D-15
Ishihara - congenital red-green
Lanthony new colour test - paeds
Retinal photoreceptors are ALSO sensitive to
UVA (near UV)
350-400
UVA is normally absorbed by
the crystalline lens
retinal damage
350-441nm
UV to visible light
define fluorescence
property of a molecule to spontaneously emit light of a longer wavelenght when stimulated by light of a shorter wavelength
–> longer = less energy