Note: The following story reflects experiences common among many of our patients. Details have been combined and changed to protect patient privacy.

Margaret didn't think much of it at first. She just figured her reading glasses needed an upgrade. Then she noticed she was turning on more lamps than usual in the evening. Then her daughter mentioned, gently, that maybe it wasn't the best idea to drive home after dark anymore.

"I kept explaining it away," Margaret says. "New glasses, bad lighting, tired eyes. It's easy to talk yourself out of thinking something's actually wrong."

It wasn't until she came in ...