Originally Posted by
lensmanmd
If you ordered the spex with a specified OC Ht, yes. If not, you will need to read it at the datum. You will also need to “anchor” the reading by determining the lens with the highest power at the 90. If the lens w/o prism has the highest power at the 90, spot it and without moving the table, check the other. If the lens with the highest power at the 90 is the one with prescribed prism, then spot it with the 1D prism and without moving the table, check vertical on the other lens. This will tell you if the prism is correct. You will also need to compare it to ANSI.
This is is the best I can offer, as the RX has not been provided to us.
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