Recently there has been a discussion as which way is correct when verifying Prescribed prism in a progressive lens. We will use the Rx of OD -2.00 sph Os -2.50 sph and OD 1 prism diopter base down and OS 1 prism diopter Base up. Upon reading the Rx, the power is correct and in the od the 1 diopter prism is there however on the os the lensometer shows that the prism is at plano. The lead tech says that we have to take into consideration equal thinning prism. However most of us disagree and think that the prism should not be at plano, and should be at the 1 diopter ring. Which is correct? Please email me back at eye1u2see2020@msn.com. Thank you for your assistance.
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