Spectacle RX -4.25 -.75 X 090
Contact Lens RX -4.00 -.75 X 090
If X is the spherical and Y is the Cylinder what powers are they?
No cyl at 90 correct? Y would be -4.25
all in effect at 180. X would be -5.00 no?
Also, do you round up or down when simply splitting -1.75 at 45 or 135?
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