I had a similar problem. My eye doctor said that your eyes CAN get tired and strained, so by evening it is harder to focus your eyes. Stronger light wouldn't help as I still couldn't focus. He gave me a new prescription to use all day (I usually only use glasses for driving, and I still have to use my other glasses for that). These glasses are designed to decrease the strain all day, so hopefully by nighttime there is still something left to "see" with. Good luck, hope something works for you.