This review found that castor oil can thicken and stabilize your tear film, the protective layer on your eye surface. It has anti-inflammatory and antimicrobial properties that may help with dry eyes, meibomian gland dysfunction, and blepharitis—and it stays on your eye longer than many other treatments, meaning better results with less frequent application.

This is a literature review that synthesized existing research on castor oil's chemical properties and how they work against dry eye disease and related conditions. The authors analyzed the biochemical mechanisms behind why castor oil is effective for ocular surface problems.

Funding not disclosed in abstract