Carbohydrate chains, or glycans, play a crucial role in maintaining eye health and protecting vision. These complex molecules are attached to proteins and lipids on the surface of eye cells, forming glycoproteins and glycolipids. They contribute to the structural integrity of the cornea, lens, and retina, while also facilitating cell communication and immune responses. Glycans help maintain tear film stability, preventing dry eye syndrome, and protect against oxidative stress, which can lead to age-related macular degeneration (AMD). Understanding the role of carbohydrate chains in eye health opens new avenues for developing treatments for vision disorders and improving ocular care.