Read under good light.

From 1986 but still timely, this New York Times article by Elaine Louie: "Expert Advice on Selecting a Good Reading Lamp."

• The older you get, the more light you need. When you're young you can read by low light or no light. At 60, you need around 100 watts.
• Too much light is as bad as too little. Glare hurts your eyes.
• Avoid high contrast. "What you want is a well-lit room where the reading area is illuminated by a generous, focused pool of light, and the surrounding area by comfortable ambient lighting."
• Translucent shades are best for reading.
• Three-way bulbs (50-100-150) are most comfortable and useful.
• A reading lamp should be placed to the side and slightly behind the reader. It can go on either side. "But to avoid the shadow of your arm while writing and reading simultaneously, a right-handed person should place the lamp on the left."