Using your eyes in dim light does not damage them. For centuries, all nighttime reading and sewing was done by candlelight or with gas or kerosene lamps. However, good lighting does make reading easier and can prevent eye fatigue.
Yes, but not as badly as you might have thought when your parents scolded you for reading under the covers with a flashlight. The idea that reading in dim light ruins eyesight was named in a 2007 British Medical Journal study as one of seven medical myths doctors are likely to believe. Reading in low light does not damage eyesight, but it does cause eyestrain. Eyestrain develops because your visual muscles get mixed signals. In low light, the iris relaxes to open the pupil wide to collect the most light. But when you read, the iris contracts to help the eye focus on the text. With eyestrain, your eyes can feel dry, itchy and sore. Your vision also can blur, a symptom that overlaps with nearsightedness. Perhaps that's where this myth originated. So, yes, although reading in low light can make your eyes sore, it won't hurt your eyesight. To avoid eyestrain, turn on another light or take breaks every 15 to 30 minutes.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.