A recent study by researchers from Cincinnati Children’s and the University of Alabama at Birmingham suggests that indoor lighting may play a role in mitigating the rising prevalence of myopia (nearsightedness) among children. Published on August 18, 2026, in Cell Reports Medicine, the research highlights the potential of indigo light—a short wavelength of visible light abundant in natural sunlight but largely absent from standard white LED lighting—to prevent myopia development. Experiments conducted on tree shrews, whose visual systems closely resemble those of humans, demonstrated that exposure to indigo light (wavelengths between 419 and 446 nanometers) completely prevented the onset of nearsightedness.
The study underscores the evolutionary mismatch between the light spectrum humans have historically been exposed to outdoors and the limited spectrum provided by modern indoor lighting. Standard white LEDs, while sufficient for normal vision, lack significant indigo light, which appears to activate nonvisual opsins involved in biological processes beyond image formation. The researchers propose two potential strategies to address this issue: increasing children’s outdoor time to expose their eyes to the full spectrum of natural sunlight and redesigning indoor lighting to more closely replicate outdoor light conditions, including the addition of indigo wavelengths. Future research will involve installing indigo-enriched lighting systems in daycare settings to assess their efficacy in reducing myopia rates among children. Source