how are we able to see distance and nearby objects clearly? which part of eye helps in changing curvature of lens ?why no image is formed at the blind spot?
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When the object distance changes accordingly the focal length of the eye lens changes such that the image is formed at retina.The eye lens is attatched to the cilliary muscle that change the focal length of the convex lens i.e.eye lens by contracting to decrease focal length and relaxing to increase focal length. The image is formed at the blind spot. It is formed but not recepted or you can say detected by the brain because no rod or cone cells are present at the blind spot because through this point optic nerves enter the eye.
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We can see distant and near objects clearly because of the property of accommodation of eye. Accommodation is the name given to the ability of the lens of the eye to change its focal length and produce focused images of both distant and near objects on the retina.
Ciliary muscle helps in changing curvature of the lens. They are attached to the lens and contract or release to change the lens shape and curvature.
No image is formed at blind spot because there are no photo receptors, i.e., cones and rods to detect the light and send it to brain.
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