Hello all,
I'm wondering if anybody can help me determine an appropriate add power for patient needing to work at a fixed distance of 19 inches. Patient's RX is OD +1.75 +.50 x15, OS +1.00 +.50 x80. Prescribed reading add is 2.75. Patient needs a round add power in the upper corner of OD lens and will be using it monocular to read instrumentation at 19 inches. I know Xcel's Acclaim series of trifocals uses a 61% intermediate for pilots working at a similar distance. Wondering if anybody has the formula handy that can help determine appropriate upper add power in this scenario.
Thanks in advance
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