How to recover after looking away from the sheet music while playing.
Marco mentioned a trick that you can use to allow you to easily find the place in the score after you take time to look down away from your sheet music for any reason, ie; to check either your left or right hand placement.
The secret is to train your brain to do this. His suggestion is to pick an item in your house that you want to remember such as a hook on your curtain rod. While watching TV, look up quickly to find that hook and then return to watching TV. Do this over an over, and eventually you should be able to find the hook easily before you return to watching TV. The more times you do it, the easier it should become.
Relating this to music playing, pick the place on the score that you need to remember, look away from the sheet music when you feel it necessary, then return to the score. It should be easy to do once you learn this trick.
Tips and Techniques from Marco Mendez.
How to recover after looking down at your left hand while playing.