[amalgamated_inc]

My (limited) experience with optometrists is that they're a total scam. Went to one, looked in the machine, paid a lot of money for glasses. The glasses immediately gave me headaches. Never wore them again and my eyesight is still 20/10 (somehow one eye is significantly better than the other, but apparently that's not uncommon).

Do you perceive your eyesight to be better?

I honestly think that your own experiments and experience are worth their weight in gold here. Keep on experimenting and don't listen to people reading from textbooks.

[sfusato]

Matches my experience as well. I mean, if after scanning my eyes with all those shiny machines, you still need to ask me "Is this better? Is this worse?" like 20 times up until I just give up, well, that doesn't feel like a very scientific and foolproof method.

[hintoftime]

My optometrist actually said that finding a prescription that works is more like a wine or chocolate tasting than a precise measurement and giving me a hard time for not being able to decide whether one lens or the other is better.

[amalgamated_inc]

The Scientific Sales Method:

1. Formulate hypothesis

2. Ask customer "Is this better?" Is yes, you make a sale.

3. "How about now?"

4. Goto 2