Reading in dim light ruins your eyesight: You can get eyestrain and have difficulty focusing when trying to read in poor lighting, but these symptoms have no permanent effect on eyesight. One current theory holds that nearsightedness (myopia) might be caused by reading in dim light or holding books too close to the face. But consider this: rates of myopia are increasing and are higher now then they were centuries ago when people read by candlelight. What’s more, the BMJ researchers found hundreds of expert opinions that conclude that reading in dim light doesn’t permanently hurt your eyes.

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