Session 2 Flashcards
1
Q
What are the key components to a prescription? 6
A
Sph, Cyl, Axis, ADD, Prism, PD
2
Q
Where is sph in a lens?
A
All over the lens
3
Q
What is cyl?
A
The difference between the two major powers on the lens
4
Q
What is axis?
A
Axis of the sphere and always written with 3 numbers
5
Q
What are the 3 forms to writing a prescription?
A
Plus Cylinder Form
Minus Cylinder Form
Crossed Cylinder Form
6
Q
Practice 5 examples of putting the prescription into 3 different forms.
(Show working for crossed cyl form how shown in class) ——Turn Over Card
A
Now plot the prescriptions onto Optical Crosses
7
Q
What is an Optical Cross?
A
Visual representation of where the dioptric values sit at their axis on a lens.
See examples
