New York, N.Y. — A surge in nearsightedness, often linked to the rising use of smartphones, may have deeper roots than previously thought. Researchers at the SUNY College of Optometry have identified two contributing factors: dim indoor lighting coupled with extended periods of close-up focus. Their findings, published in Cell Reports, highlight that myopia isn’t solely intensified by screen time, but rather by how we interact with our surroundings under low-light conditions.
Currently, nearly half of the global population is projected to be affected by myopia by 2050. This eye condition occurs when the eyeball is slightly elongated, complicating the ability to see distant objects clearly. While the rise of personal devices has garnered significant attention, the researchers emphasize that environmental factors, particularly lighting conditions, play a crucial role in this ocular epidemic.
Urusha Maharjan, a doctoral student at SUNY and the study’s lead author, explained how indoor environments challenge eye health. "In bright light, the pupils constrict naturally, allowing just the right amount of light to reach the retina," Maharjan said. "However, when focusing on close objects in dim conditions, pupils constrict to enhance image clarity rather than brightness, ultimately reducing necessary retinal illumination."
This inability to adequately stimulate the retina while viewing close objects in low light could significantly hinder normal vision development. The study suggests that excessive pupil narrowing may be especially detrimental for those who are already nearsighted, as prolonged exposure to low light can exacerbate the condition.
In contrast, bright environments allow for proper pupil function, where constriction occurs in response to light intensity rather than the distance of the object. This functional difference underscores the importance of lighting in preventative measures against myopia.
Despite the potential significance of these findings, the theory presented within the study requires further research for validation. Jose-Manuel Alonso, a co-author and professor at SUNY, acknowledged the need for more extensive testing. “While this research doesn’t provide absolute answers, it offers a new framework for understanding how visual habits and lighting interact,” he stated.
As the world increasingly embraces digital screens, it becomes essential to recognize the environmental factors impacting our eyesight. Awareness about lighting conditions could lead to healthier visual habits and ultimately slow the alarming trend of nearsightedness.
In a previous version of this article, there was a mention of reading glasses. It is important to clarify that this discussion pertains specifically to myopia, which is often corrected with glasses designed for distance vision.