Researchers propose that dim indoor environments during prolonged close-up work may play a larger role in rising nearsightedness rates than screen use alone.
By yourNEWS Media Newsroom
A new study from the State University of New York College of Optometry suggests that the global rise in nearsightedness may be driven less by screens themselves and more by the dim indoor lighting conditions in which people use them.
Myopia, or nearsightedness, occurs when the eyeball elongates, causing light to focus in front of the retina rather than directly on it. The result is blurred distance vision. Rates of myopia have increased sharply over recent decades, with projections estimating that nearly half of the global population could be affected by 2050. In parts of East Asia, prevalence among young adults approaches 90 percent.
The rapid acceleration of cases suggests environmental influences are at play beyond genetics alone.
The SUNY study, published in Cell Reports, introduces a hypothesis linking retinal light exposure during close-up tasks to eye growth. According to the researchers, when individuals engage in near work—such as reading, studying, or using digital devices—the pupil naturally constricts to sharpen the image. In bright outdoor light, sufficient illumination still reaches the retina despite this constriction. Indoors, however, lighting levels are often significantly lower.
The study proposes that in dim environments, the combination of near focus and reduced brightness may decrease the amount of light reaching the retina to levels insufficient to signal normal eye growth regulation. In response, the eye may elongate, contributing to the development of myopia.
Lead investigator Urusha Maharjan explained that bright outdoor conditions provide strong retinal stimulation even when the pupil narrows. By contrast, indoor lighting frequently fails to reach comparable intensity, particularly during extended periods of concentrated near work.
This framework offers a unifying explanation for several observations in myopia research. Interventions such as atropine drops, multifocal contact lenses, and other optical treatments appear to influence retinal signaling during focusing tasks. Negative lenses, commonly used in experimental settings to induce myopia, also alter retinal illumination by causing the pupil to narrow while straining to focus—an effect intensified in dim settings.
The findings suggest that environmental brightness may influence the effectiveness of existing treatments. Even specialized lenses or medications may provide limited benefit if individuals continue to perform prolonged close-up tasks in low-light conditions.
The hypothesis shifts attention away from screens as the sole driver of the myopia epidemic. While extended device use remains a concern due to prolonged near focusing, the study indicates that insufficient ambient light may be a key contributing factor.
Researchers caution that the study involved a limited subject group and does not establish definitive causation. However, it presents a testable physiological mechanism linking lighting conditions, retinal stimulation, and eye growth.
The implications are practical. Increasing indoor brightness during reading, studying, or screen use may represent a simple, low-cost preventive measure. Enhancing environmental lighting—through additional lamps, open blinds, or brighter fixtures—could potentially support healthier eye development, particularly in children and adolescents.
The findings also reinforce long-standing observations that time spent outdoors appears protective against myopia progression. Outdoor environments provide substantially higher light levels than most indoor settings, even on overcast days.
As myopia rates continue to rise globally, the study reframes the discussion. Rather than focusing exclusively on reducing screen time, researchers suggest examining how and where close-up work occurs. Environmental brightness, they argue, may be a critical but overlooked factor in preserving long-term visual health.
Source: Natural News
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