Help please with a question about equalizing and balancing.
Over the past year I’ve been wearing normalized and differential. I became aware that one eye had become much stronger than the other and the optometrist confirmed that in fact the weaker eye has developed worsened astigmatism of -1.25 which she thinks might be contributing to migraine.
So I am looking to make the weak eye more active, as it seems to be letting the strong eye take the lead and so is worsening.
Please could you link to any topics about how to deal with this.
I am aware of three principles to take into consideration:
for normalized, presumably i follow the rule to ‘add 0.25 of sphere when deducting 0.5 of cyl’
for close up i might not need cylinder. does that mean i don’t need to follow the rule to ‘add 0.25 of sphere when deducting 0.5 of cyl’?
the rule to keep all prescriptions in the same proportions seems to contradict the above 1 and 2?
I would also like to ask what is the best value trial lens set currently available to the UK, that is good enough to be useful.