I’ve seen recommendations to only make CYL reductions after 1-2 successful SPH reductions.
I’ve also read to “maybe” drop astigmatism all together if it’s very low (below 1 diopter). And I’ve read that 0.25 SPH can sometimes substitute 0.50 to 1.00 CYL.
Taking all this into account, I wondering why not reduce a little CYL with each SPH?
For example, here’s a hypothetical example of SPH and CYL:
1st prescription = -6.00 -2.00
2nd prescription = -5.75 -1.75
3rd prescription = -5.50 -1.50
I am not doubting the method. Years of trial and error are good enough for me to follow the advise. But I’m just wondering what usually happens when minor CYL reductions are combined with the 0.25 SPH reductions.