viii. When a myopic (near-sighted) person looks at a far away object, the object

Question

viii. When a myopic (near-sighted) person looks at a far away object, the object looks blurry. To make the object appear less blurry, the person squints. Why does this work? a) Squinting reduces the spread of the light entering the eye. The image still doesn't form on the retina, but b) c) the blurriness of the image decreases, as in the pinhole effect. Squinting increases the curvature of the eye which moves the focal point of the eye. This allows the image to form closer to the retina, resulting in a less blurry image. Squinting changes the shape of the eye in such a way that the retina is moved farther away from the lens without affecting the lens focal length. This allows the image to form closer to the retina, resulting in a less blurry image. d) It doesn't work, actually

Explanation / Answer

Answer:-

  Clear vision is a result of light rays that properly focused on the retina located in the back of the eye. Typically, this is done with glasses or contact lenses; both of which bend light into focus and therefore correct vision.Believe it or not,when myopia person squint they are actually changing the shape of their eyes ever so slightly, and by doing so the light is focused correctly back onto the fovea. Light traveling into our eye comes from many different angles and must all be focused together onto a single area at the back of the eye. ThereFore,When myopic person squint,Squinting changes the shape of the eye in such a way that the retina is moved farther away from the lens without affecting the lens' focal length. This allows the image to form closer to the retina,resulting in a less blury image.

So,the correct option is (c)

  

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