Nearsightedness is on the rise globally, with experts predicting nearly half the world's population could be myopic by 2050. While excessive use of smartphones and computers is a known factor, a recent study points to dim indoor lighting as a potential contributor.
The study from SUNY College of Optometry suggests that myopia is triggered not by digital devices themselves, but by the low-light environments in which they are used. When focusing on close objects in dim light, the pupil constricts to sharpen the image, but this significantly reduces light reaching the retina. This lack of retinal illumination may signal the eye to grow longer, leading to blurred distant vision.
Conversely, bright outdoor light provides ample retinal stimulation, overriding the "stop growing" signal even when pupils are constricted. Researchers hypothesize that increasing indoor brightness during close-up work could be a simple method to combat the global nearsightedness epidemic.
While the study acknowledges limitations, it offers a testable hypothesis on the interaction between visual habits, lighting, and eye focusing.