Dim Indoor Light, Not Just Screens, May Be Fueling Myopia Surge

For years, rising rates of myopia – or nearsightedness – have been largely attributed to increased screen time, especially among children and young adults. However, new research suggests the explanation may be more nuanced. Scientists at the State University of New York (SUNY) College of Optometry propose that the critical factor may be the amount of light that reaches the retina during prolonged near work, especially in indoor environments.

The Role of Light and Pupil Constriction

The study, published in Cell Reports, indicates that it’s not just devices themselves, but the combination of prolonged close-up focus and dim indoor lighting that may quietly strain the eyes. When we focus on a phone, book, or tablet in dim light, the pupil constricts to improve image clarity. This constriction may reduce the amount of light reaching the retina, potentially impairing the visual stimulation necessary for normal eye development. Source

Myopia Prevalence is Increasing

Myopia now affects nearly 50 percent of young adults in the United States and Europe, and close to 90 percent in parts of East Asia. Source While genetics play a role, the rapid increase over just a few generations strongly indicates the influence of environmental factors.

A New Hypothesis for Myopia Progression

The research offers a new hypothesis that could help explain why seemingly different factors – near work, dim indoor lighting, atropine drops, multifocal lenses, and time spent outdoors – all appear to influence myopia progression. The common denominator may be their effect on the amount of light reaching the retina and the regulation of pupil constriction during visual adaptation. Source

How Negative Lenses and Bright Light Impact the Eyes

The results showed that negative lenses increase pupil constriction by enhancing the adaptation process when focusing at close distances, and this effect increases with reducing the viewing distance or using stronger lenses than necessary, especially when focusing for long periods. This effect is more severe in people who have already become nearsighted. Source

Conversely, exposure to bright light outdoors provides stronger stimulation of the retina, even as the pupil constricts to protect the eye from the brightness, which may help maintain healthy visual development. Source

Implications for Prevention and Treatment

If this hypothesis is confirmed, it may reshape prevention and treatment strategies. Maintaining adequate lighting during close work and reducing the need for excessive adaptation by using appropriate visual aids, in addition to encouraging more time outdoors, could become essential recommendations. Source

Managing Myopia: Available Treatments

The University Eye Center at SUNY College of Optometry offers several options for myopia management, including MiSight daily disposable contact lenses, which are FDA-approved to slow myopia progression. Source Low-dose atropine eyedrops and other contact lens options may also help, although they are not currently FDA-approved. Source The average rate of myopia progression is about 0.50 diopter (D) per year, and generally stops in the late teens to early twenties. Source

A consultation with the Myopia Management Clinic at SUNY Optometry is available for $65 (not covered by insurance). Contact them at (212) 938-4015 or myopia@sunyopt.edu for more information. Source

Disclaimer: This content is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.