When I ordered my husband’s diffs, I followed what I thought Jake meant in the 7-day email course regarding lowering/dropping CYL. Here was the original “prescription”:
R = -5.25 CYL -0.25, L = -5.00 CYL -0.50.
I lowered the spherical by 1.5, then dropped the -0.25 CYL in the R eye and subbed 0.25 spherical for the 0.50 CYL in the L, resulting in
R = -3.75, L = -3.75
But now that we’re getting ready to order normalized, I’m wondering if I did that right. I understand the principles are:
- Two spherical drops before astigmatism drops or equalizing.
- Keep same focal planes (both eyes on the same ratio) between diffs and norms.
He hasn’t been complaining about his diffs, but when I asked, he did say he gets a headache when looking at our less clear resolution computer screen (which is also a little farther away). Books and iPad are OK. I’m wondering if it would be best to –
- Redo the diffs with just a 1.5 spherical drop, leaving CYL and eye difference the same, or
- Go ahead and order norms as an equalized, no CYL pair at probably -5.00 for both eyes.
In other words, is it better to drop CYL already when it’s so low, and make the 1st norms match the focal plane of the diffs already gotten, or to start over and keep the CYL in both diffs and norms until we’ve done two spherical drops?
A little more information that may pertain: he’s had contacts before, with this same glasses prescription, that were equalized with no CYL at -4.75 in both eyes. He seemed to do fine with that (though I don’t know why the optometrist put less diopter in the prescription without CYL; I though it would have had more SPH since CYL was dropped?).
I hope this isn’t “diopter specific.” Please treat it as a question of which principles are highest priority.
I realize also that this is a bit of a trial and error thing, but I thought it might be good to get the more expert advice of those who have already traveled this path! Thanks in advance.