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Is reading in the dark bad for your eyes?

Victoria Fowler

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Tara Andrews on November 14, 2018

Response . According to "Howstuffworks.com":. Most experts agree that reading in low light does not damage your eyes. Can cause eye strain , however, has a number of unpleasant temporary symptoms and possibly some of the long-term effects.. When the room light is low, your eye adjusts in several ways. In the first place, the rod and cone cells in the retina begin to produce more light-sensitive chemicals. These light-sensitive chemicals are the first step in the detection of the light, converting it into an electrical signal, and to transmit this electrical signal to the brain. Second, the iris muscles relax, causing the opening of your eye, the pupil , to become very large. This allows your eye to collect as much light as possible. Finally, the nerve cells in the retina adapt so that they can work in low light conditions. These three changes take about 20 minutes to 2 hours, but increases their sensitivity to low light by about 10,000 times.. When reading, the eye must be able to focus an image of the words on your retina. To do this, the iris, as well as the muscles that control the shape of the lens, must contract to keep the focused image on the retina. If you read in low light, your visual muscles get mixed signals: Relax to collect the most amount of light, but at the same time, the contract to maintain the focused image. When the object is poorly lit, focusing becomes even more difficult because the contrast between the words and the page is not so large, which decreases the ability of the eye to distinguish visual details. That ability is called visual acuity . Your eyes have to work harder to separate the words from the page, which strains your eye muscles. Consider that this exercise is strenuous to the muscles of the eyes. So your eye muscles will ache, much as your arm muscles and leg muscles become sore after strenuous exercise.. When your eyes are working just as hard over a long period of time, stress can cause a number of physical effects. The symptoms of eye strain include eye pain, headaches, back and neck aches, drooping eyelids and blurred vision. Because you often do not blink enough when focusing on a single object, you may also experience uncomfortable dryness in his eyes. None of this damages the eyes, and all this goes away after you stop the tension. Many eye doctors to leave, but some note that eye strain may contribute to nearsightedness . Most people who are nearsighted were born that way, but there is evidence that prolonged eye strain can make it worse.. If you feel comfortable reading with a flashlight (or other low light) and do not experience any of the above symptoms of eye strain, it is probably well to read this way. It is certainly easier on your eyes to read in good light, however. You can also avoid eye strain when you're reading by blinking frequently and taking a moment to focus on something outside the window or across the room every 15 to 30 minutes.


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