Butterfly Pea (Clitoria ternatea) is primarily used in traditional medicine systems, particularly in Ayurveda and Thai herbalism, to support eye health. In Ayurveda, the flower is known as "Shankhpushpi" and has been attributed with benefits for the brain, nerves, and eyes, often prescribed in traditional formulations for its supposed ability to improve eyesight and reduce eye strain. This traditional use is largely based on empirical evidence and the doctrine of signatures, where the vivid blue color of the flower was thought to enhance vision.

Modern scientific validation for Butterfly Pea’s direct effect on eye health is limited. Some studies have identified that the plant contains high levels of anthocyanins, especially ternatins, which are antioxidants known to support vascular health and may theoretically benefit the small blood vessels in the eyes. However, robust clinical trials specifically demonstrating an improvement in human eye health or vision outcomes are lacking. Most research is preliminary, conducted in vitro or in animal models, and focuses on general antioxidant activity rather than direct ophthalmic benefits. Thus, while its use for eye health is well established in traditional medicine, evidence from modern science remains weak and indirect.