1. Wear sunglasses to protect your eyes from the sun's harmful ultraviolet rays.
2. Wear blue-filtering glasses to protect your eyes from digital devices (phone, tablet, computer, TV and fluorescent lights, for example) harmful blue light.
3. Take vitamins containing lutein, zeaxanthin and mezo-zeaxanthin to slow down (and possibly reverse mild cases).
4. If you smoke, quit.
5. Eat green leafy vegetables.