One of our competitors nearby recently closed for good. We are now getting a lot of their clientele. That's a whole can of worms for various reasons (the last man standing there was not formally trained and was telling his patients/customers a lot of incorrect information or getting hostile with them).
Anyway, apparently for computer progressives and computer bifocals he would tailor the intermediate power for the exact focal distance the patients wanted. He'd have them take a yardstick and measure the distance from themselves to the computer screen.
I typically just use the traditions half of the near add to determine my intermediate powers unless the prescribing doctor specifies otherwise. I am not seeing a formula for this in my Optical Formulas Tutorial workbook. Say someone wants a flattop bifocal with intermediate on top and near on bottom for organ playing and they sit 35 inches from where their sheet music is. What formula or method should I be using for this? (I don't have trial frames and they probably won't allow me to order a set due to cost). Normally I will just have someone try on different pairs of OTC readers to try and get an idea for what the intermediate add should be when the near add isn't an easily half-ed amount like +2.75, but that isn't really ideal.
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