There is no single food that is best for the eyes, because vision health depends on a balanced intake of different nutrients and the regular consumption of several foods rich in eye-beneficial nutrients.

However, some foods are particularly rich in nutrients that are important for eye health. Here are some examples :

Dark green vegetables, such as spinach, kale, and broccoli, are rich in lutein and zeaxanthin, antioxidants that help protect the retina against blue light and free radical damage.
Carrots, sweet potatoes, and red peppers are rich in vitamin A, which is important for corneal health and for twilight vision.
Citrus fruits, berries, and kiwis are rich in vitamin C, an antioxidant that helps prevent age-related macular degeneration and cataracts.
Fatty fish, such as salmon, mackerel, and herring, are rich in omega-3 fatty acids, which can help reduce inflammation and improve retinal blood vessel health.

In general, it is recommended to follow a balanced and varied diet, including a wide variety of nutrient-dense foods.