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Something that helps me a great deal is to play with a mirror. I keep two small ones in front of me just below the sheet music. I have a small shelf that attaches to the music stand so I can keep one there that allows me to see most of the fret board. I keep a second smaller one to the right of the first mirror, that I have angled so I can see the soundboard. My eyes can shift quickly between them and the sheet music without losing my place and it removes the issue of a sore neck/back. They are quick and easy to adjust to exactly where I need them so I can see what I want at any given time. The type of mirror is just a small portable travel mirror and they come in quite a few sizes/styles.