My girlfriend has been a photographer her whole life and is now attempting to start a professional business. Recently Ive noticed that her left eye is not able to remain focused i.e. it moves to the left. It is worse when she is tired or not concentrating. She always takes photos with her right eye and I think some imbalance has developed. When I try to use her digital camera if gives me a headache after a few shots, I think the focusing is the worst part. Sorry for not using the correct photography language, but I am very worried for her. Any advice would be greatly appreciated.