Vision Flashcards
1
Q
What is the accommodative power ?
A
Measured in dioptres,
Not fixed, depends on the object
AP = 1/near point- 1/far point,
In normal people with no myopia the far point is infinity so it is measured using near point
2
Q
What is snell’s law?
A
Sintheta1/sintheta2=n2/n1=v1/v2
Where n is the refractive index
V is the speed of the light
Theta is the angle the light makes with the imaginary line perpendicular the the plane which it enters
3
Q
What is deuteranopia and protanopia?
A
Deuteranopia: reduced sensitivity to green (lack of M cones)
Protanopia: reduced sensitivity to red (lack of L cones)
Triatanopia: reduced to blue(rare)
