Formulas/equations Flashcards
1
Q
every .25D =
A
.05mm radius
2
Q
converting Diopters to radius and vica versa
A
337.5/[diopter power/radius(mm)]
3
Q
spherical equivalent
A
divide cyl power in half and add it to sphere power
4
Q
f=Diopter power/(1-original lens power x distance (m) lens is moved
A
Vertex formula
5
Q
moving lens toward eye
converting spectacle RX to CL Rx
A
make distance positive
6
Q
moving lens away from eye
converting CL RX to spectacle RX
A
make distance negative
