Optics Flashcards
Visible light lies between _nm and _nm
400 to 780 nm
UV - A is mainly absorbed by
lens
UV _ and UV _ are absorbed by
cornea and sclers
Light is perceived by three population of photoreceptors in the retina which are sensitive to light of ___, ___, ____
short - blue
middle - green
long red
Absence of green cone function
deuteranopia
Absence of blue cone function
protanopia
Absence of red cone function
tritanopia
Shift in spectral sensitvity of green cone function
deuternaomaly
shift in spectral sensitivity of blue cone function
protanomaly
shift in spectral sensitivity of red cone function
tritanolay
Red and green pigment is coded for on ___ chromosome
X chromosome
Blue pigment coded for on ___ chromosome
Chromosome 7
Acquired optic nerve disease leads to ________ colour defect with the excpetion of glaucoma and autosomal dominant optic neuropathy
red green
Glaucoma and autosomal dominant optic neuropathy can cause ___ colour defect
blue yellow
Acquired retinal disease tends to cause ___ colour fecet excep cone and Stargardt’s disease
red green
What is most comprehensive method of testing colour vision
Farnsowrth Munsell hue 100
Ishihara specifically tests for ____ defects
red green
Fluroscein is excited by ___ light of ____nm
blur light of 465-490 nm
FLuroscein emits _____ light of ____ nm
yellow green light of 520-530nm
______ occurs where there is an overlap in spectral transmission of excitation and barrier filters
pseudoautoflurosence
ICG aborbs ____nm and emits ____ nm ____ radiation
absorbs 805 nm and emits 835 nm infrared radiation
ICG is useful to see
choroid neovascularisation
Light waves in phase are called ____
coherent
light waves out of pahse are called ____
incoherent
