Calculate F1 and F2 from certain variables

[Bok]

Hello,

If given the following set of variables how would one calculate the front curve F1 and the back curve F2?

	Sph	Cyl	Axis	O.C	Height	Vertex	Panto	Facial Wrap
OD	2.75	-0.5	40	32	18	12	8	10
OS	-2.00	-1.75	74	32	18	12	8	10

Frame Details	A	B	ED	DBL		Lens Index
	50	32	55	17		1.498

Can you show the working?

Thanks in advance for your help.

[Bok]

Hello,

If given the following set of variables how would one calculate the front curve F1 and the back curve F2?

	Sph	Cyl	Axis	O.C	Height	Vertex	Panto	Facial Wrap
OD	2.75	-0.5	40	32	18	12	8	10
OS	-2.00	-1.75	74	32	18	12	8	10

Frame Details	A	B	ED	DBL		Lens Index
	50	32	55	17		1.498

Can you show the working?

Thanks in advance for your help.

Or what about Radius? R1 and R2?

[MikeAurelius]

There is no way to determine it based on the available data. 'By the book', you'd normally run a 8 base right, 4 base left, however, that's going cause some problems, split the difference and run a 7 base Right and a 5 Base left, or a 6 Right 5 Left.

[mshimp]

7 RT 3 LT or 6 RT 2 LT. Mike is right, there appears to be some missing information. Not unless some assumptions are made here in regards to determining Iseikonic lens.