How can you believe your eyes when they're not yours?

Based on the Hong Kong film Jian Gui, The Eye features Sydney Wells (Jessica Alba) as an accomplished, independent, Los Angeles-based concert violinist. She has been blind since a childhood tragedy but as the story opens she undergoes a double corneal transplant to restore her sight. After the surgery, neural ophthalmologist Dr. Paul Faulkner (Alessandro Nivola) helps Sydney with the difficult adjustment, and with the support of her older sister Helen (Parker Posey), Sydney learns to see again. But Sydney's happiness is short-lived as unexplainable shadowy and frightening images start to haunt her. Are they a passing aftermath of her surgery, Sydney's mind adjusting to sight, a product of her imagination, or something horrifyingly real? As Sydney's family and friends begin to doubt her sanity, Sydney is soon convinced that her anonymous eye donor has somehow opened the door to a terrifying world only she can now see.