Researchers have engineered eye drops containing photosynthetic components from spinach, enabling mouse eyes to perform photosynthesis and alleviate dry eye symptoms. The study, published in a peer-reviewed journal, demonstrates a radical new method for treating ocular surface disorders.
The drops deliver thylakoid membranes—the light-capturing structures from spinach leaves—directly to the cornea. When exposed to light, these membranes generate oxygen and other molecules that may help restore cellular function and moisture balance.
In experiments, mice with induced dry eye received the drops and showed significant improvements in tear production and corneal health compared to controls. The treatment did not turn the animals' eyes green, nor did it cause any apparent toxicity.
The approach could lead to non-invasive therapies for dry eye, a condition affecting millions worldwide. However, human trials are needed, and challenges remain, including ensuring long-term stability of the photosynthetic material.
Critics caution that mouse models may not fully replicate human dry eye, and the reliance on light exposure could limit practical use indoors or at night.