Hi..jus wondering if someone could help me on the following question:

A plano concave -10.00DS back vertex aspheric spectacle lens has a p2 value of -0.5. If the refractive index of the material is 1.5, and the centre thickness is 1.0mm, what is the lens diameter if the edge thickness is 6.0mm?

Thanks

A plano concave -10.00DS back vertex aspheric spectacle lens has a p2 value of -0.5. If the refractive index of the material is 1.5, and the centre thickness is 1.0mm, what is the lens diameter if the edge thickness is 6.0mm?

Thanks

## Comment