Labs do not grind the cylinder on the front surface simply because the RX is written in the plus form. I don't believe that simifinshed lenses are produced any longer. Besides that, this would only be possible with single vision lenses (for reasons that should be obvious to properly trained opticians). Lenses like this would likely cost considerably more. It presents no problem for a lab if you order a job written with one plus cylinder and one minus. If it is an error, it is the fault of the person calling in or writting up the order, and would be subject to labs remake policies. However, a decient lab manager would train their customer service personel to do a bit of extra verification, in this case. Just as with prism up and up, down and down, in and out. Please verify the order is properly given AND the RX is properly written, even if this requires a conversation with the prescriber.
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