Light And Dark Adaptation Flashcards
1
Q
What is the implicit time
A
the measurement from onset of stimulus to the
peak/trough concerned
2
Q
What is the amplitude in an erg
A
a-wave - measures from baseline to trough of a-wave b-wave - measures from -wave trough to b-wave peak
3
Q
In an erg, cones can detect flickers at upto… Hz
A
70
4
Q
In an erg, rods can detect flickers at upto… Hz
A
20
5
Q
Patterns in erg:
A
‘P50’ = positive 50ms = damage to the inner retina
‘N95’ = negative 95ms = damage to optic nerve
6
Q
Describe photopic & scotopic erg.
A
7
Q
Damage to choroid effects which erg wave
A
A
8
Q
Damage to central retinal art yet effects which erg wave
A
B
