My eyes hurt, but hurt much more after reading a book or computer screen for a while. Solution or similar?

After reading a book or computer screen for about 5 minutes, I must stop because of eye pain - this has been happening for about two years. The most pain seems to be in the front of the eyes. Have seen a few eye doctors, but haven't identified the problem. Have tried prescription gles and contacts, blinking regularly, eye drops, eye exercises, medications, and different lighting. This not a dry eye problem, but could be related to menopause although hormones are in balance. Hoping for a solution.