If your eyes are healthy, you should be able to comfortably see objects which are many kilometers away and to immediately shift your gaze to read a book of small print lying on your knee. You should be able to do this instantaneously with no conscious feeling of your eyes having changed focus.
As you read this article, light rays are reflected from this platform and pass through the pupil of your eye. The lens of your eye focuses the light rays onto the retina which responds by sending messages to the brain through the optic nerve. Some common defects of the eyeball may be either inherited from your parents or occur as you grow older. Many people are short-sighted all their lives, while others find it more and more difficult to read books and do close words as they pass middle age. Spectacles or contact lenses of the right shape can make up for the eye's defects by correctly focusing the light rays onto the retina.
You can keep your eyes strong and healthy by reading and studying only in a well-lit area. Also, eat plenty of vegetables such as carrots, which are good for your eyes.
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