I found that if I took lyric/music sheets on stage my eyes were drawn to them even when I didn't need the prompt. I was being drawn further into my safety net and further away from the audience which appreciates a little eye contact from time to time. Age has provided the solution. I can't see crib sheets unless they're 6in. from my nose so I sing a lot in the car until I get the song down tight. It's the only way!!