bmlyeryl - Here are some suggestions for you and where they come from.
Are you familiar with Adam the Dreamhealer? Dreamhealer
I love to read about him. My take on him is that when we are "healed" we have a certain energy vibration. Adam, for some reason, is able to manipulate that energy vibration (aura) of others and then it is their job to hold or maintain that energy vibration which is done primarily through visualization.
I combine my understanding of Adam's work with a 20th century woman named Agnes Sanford who practised "Christian" healing. She wrote of instantaneously healing a man whose artery was severed and gushing in a train wreck. BUT she also writes about developing that ability. The process can be slow.
I believe in the process and I work on it often. I don't always receive the results that I want but I choose not to give up. For instance, last Saturday I discovered a sore spot in the middle of the palm side of my little finger. Throughout the day it grew larger and boil like. I assume some sort of splinter was in there. I began working on concentrating healing energy towards that relatively small spot. Sunday - it was still there. I kept focusing healing energy. Monday - it was still there. I continued. Monday night - it was gone - not popped - gone.
I fell several weeks ago and hurt my wrist. I thought it was sprained but after it began healing and the swelling went down I noticed that the bone is not in the same place. I suspect it broke and needed setting. I am working on healing that bone. If I were advanced I could have done it the moment it happened. But I am not yet - however, I will NOT give up. Each day, everyday I continue my visualization of a healed arm. I know it is possible. I believe I can and will do it.
All of that is to say that I believe you can manifest 20/20 eyesight quickly - I believe that is possible. But if you don't then don't give up. Begin and don't give up. Healing yourself is more difficult than healing others because of the emotional issues attached to it.
As to your question about (my version) losing your positive energy or thoughts about perfect vision - don't worry about that just restore your belief. If you lapse then restore.
You asked another question but I have to look back and see if I can offer any suggestions.