Vegetable juice, particularly those made from carrots, spinach, kale, and other brightly colored vegetables, is often promoted for eye health due to its high content of vitamins and antioxidants. Scientific evidence supports the role of specific nutrients found in vegetable juice—especially vitamin A (from beta-carotene), vitamin C, lutein, and zeaxanthin—in supporting eye function and protecting against age-related vision decline.

Beta-carotene, found abundantly in carrots and leafy greens, is a precursor to vitamin A, which is essential for the maintenance of normal vision. Severe vitamin A deficiency is known to cause night blindness and other ocular problems. Lutein and zeaxanthin, carotenoids present in many green vegetables, are concentrated in the retina and help filter harmful blue light, potentially reducing the risk of age-related macular degeneration (AMD). Several observational studies and some randomized controlled trials have demonstrated an association between higher dietary intake of these nutrients and a reduced risk of AMD and cataracts.

However, while these findings validate the use of vegetable juice as a supportive dietary option for eye health, the strength of the evidence is moderate rather than conclusive. Much of the research is based on overall dietary patterns rather than direct intervention with vegetable juice itself. Therefore, vegetable juice can be considered beneficial for eye health, primarily when it is part of a diet rich in a variety of vegetables, but it is not a standalone cure or treatment for eye diseases.