I have had a couple conversations with a doctor recently who wanted to begin offering his patients occupational progressives. Until recently he had been manually calculating what their intermediate power was and prescribing that modified power/add combination into a regular progressive design.
I spoke with him at length about various occupational designs and how they function and his biggest concern was not being able to accurately predict what the final power was going to be in the upper portion of the lens. Ultimately we came to a consensus but I've been thinking about it and I wanted to take a closer look for my own understanding.
What is the formula required to determine what someone's intermediate prescription would be at a specific distance?
For example, if a patient had a distance Rx of -3.00 sphere OU with a 2.00 add, what would be the necessary Rx to see up to 13ft? What about up to 7ft?
I can calculate dynamic power for various occupation designs but I wanted to play with some hypotheticals to see how they would compare in various situations. Any input is appreciated.
Just to clarify, I do not need occupational lens recommendations, I have a well established knowledge of the products that are available in this category.
Thank you ahead of time for any input.
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