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Why do people with poor eyesight focus better for reading if there is a bright light on the book?
Wiki User
∙ 12y ago
when you observe anything in bright light, your pupils contract. This is the equivalent of closing the aperture on a camera. As any budding or experienced photographers will tell you, this increases the depth of focus, i.e. your eye does not need to work as hard to focus on near and far things. If the light is poor the lens in your eye has to be exactly in focus, this focus may be outside of the limits of your ability to focus. the pupil narrowed, increases the range of focus, and may well bring the item you are looking at into a range where you can accommodate focusing.
Wiki User
∙ 12y ago
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for people with poor eyesight...
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Glasses and contact lenses can make your vision clearer. However, they can be harmful to your eyesight in the long run.In order to improve your eyesight, you should do eye exercises designed to permanently improve your vision. Such exercises only take about 10 minutes a day and can be very effective if done correctly.Source: www.correct-vision.com
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books can make you smart BUT its not better than reading this answer because its reading and you can also learn new words
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Reading glasses use what property of light waves to help people see better?
refraction
