Lutein is a carotenoid found widely in egg yolks, vegetables and some other plants. It's a yellow pigment, but in high concentrations it appears orange-red. In nature, lutein absorbs excess light energy to prevent damage to plants from too much sunlight, But in humans, we use lutein in our eyes to prevent UV damage.
Lutein is found in your macular pigment, which helps protect your central vision and aids in blue light absorption. Lutein are also found in high concentrations in your macula lutea, the small central part of your retina responsible for detailed central vision. The best vegetable sources of lutein are green leafy vegetables and other green or yellow vegetables. Among these, spirulina, kale and spinach top the list. Free range eggs are a great source of Lutein.
While there’s no recommended daily intake for lutein, studies have found health benefits at a dose of 10 mg per day. Pasture fed eggs range from 1-3mg of lutetin. If you are worried about your eyes, it might be worth supplementing with lutein, as it's a cheap and effective supplement.
Factory eggs are garbage, pasture fed birds pass on way more nutrients into the yolk, especially lutein (the yellow/orange colour is due to lutein and zeaxanthin). Do some local research and find a farm supplier that allows the hens to run around and forage for food.