One of of the top rules is ‘no diopter specific advice’, this means don’t tell someone what correction they should wear, they should figure this out for themselves.
There’s arguments for and against a rule like this. Arguments for:
- The person will blame themselves instead of ‘bad advice’ which is the right mindset to improve
- Asking for exact numbers means you have to do less research, and you will end up dependent on other people for the journey
- Legal liability from scary people(?)
- You can actually generalise a lot of the time. You’ll usually get like -0.5 to -1 diopters of ciliary spasm, buy newer glasses from there and below. If you’re 20/20 without ciliary spasm, drop that by 0.25. You could probably write a decent web app to give out advice like this and it wouldn’t be half bad.
- EM struggles with onboarding as it is, pointing people who have seemed to do some research in the right direction and ‘correcting’ their own suggestions for diopters seems like a good idea. If we can generalise principles for the right and wrong way to do things, why not throw out advice?
Telling someone that their next pair of normalised having a -0.75 reduction instead of a -0.25 being a bad idea seems like a good idea to me. Spoonfeeding everything to someone is never a good idea.