Does Sleeping with Light On Cause Astigmatism in Children? The Truth About Astigmatism Revealed!
Eyes & ENTDebunking myths about astigmatism in children - learn what really causes it, how it's diagnosed, and when treatment is needed.
Does Sleeping with Light On Cause Astigmatism in Children? The Truth About Astigmatism Revealed!
Many parents worry that leaving a night light on while their child sleeps might cause astigmatism. This concern has been widely circulated online, but what does the science actually say?
The Truth: Light Does NOT Cause Astigmatism
Unlike myopia, environmental factors have a very, very small impact on the occurrence and development of astigmatism. This means that astigmatism is not caused by a lack of outdoor activities or too much close-up eye use. Having lights on around a child while they sleep will not cause astigmatism.
What Actually Causes Astigmatism?
Astigmatism is primarily determined by the shape of the cornea (the clear front surface of the eye). If the cornea is perfectly spherical, light focuses evenly. But if it's more oval-shaped (like a rugby ball rather than a basketball), light focuses at different points, causing blurred vision — this is astigmatism.
The shape of the cornea is largely determined by genetics. Most astigmatism is present from birth or develops in early childhood due to the natural shape of the eye, not because of environmental factors.