Physiology Flashcards
1
Q
Basal tear production
A
1.2 microL/minute
2
Q
Basal rate of aqueous production?
A
2-3 micoL/min
3
Q
Visible spectrum of light
A
400-780nm
4
Q
Primary metabolic substrate of cornea?
A
Glucose
5
Q
Normal pH of tears
A
6.5-7.5 (mean 7)
6
Q
After dark adaptation, how much more sensitive are rods than cones?
A
1,000 times (3 log units)
7
Q
Maximum spectral sensitivity of rods?
A
496nm corresponding to blue green light
8
Q
Reason for presbyopia?
A
Decreased elasticity of lens and its capsule
9
Q
Light reaction summarised as?
A
11-cis retinal to all-trans retinal and then to all-trans retinol.
10
Q
What is purkinje shift ?
A
Shift in peak spectral sensitivity from 555(yellow) to 505 nm(blue green) with dark adaptation
