Q. How are we able to see distant and nearby objects clearly? Which part of eye helps in changing curvature of lens? Why no image is formed at blind spot?
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the ciliary muscles help in changing the type of the lens According to the object we are seeing. because blind spot lacks in photoreceptor so it sense no image
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ciliary muscle holds the lens in position ,it contracts and release the lens that's why we see the object clearly of distant objects clearly..the retina of our eye has large number of light sensitive bcells having rods and cons. the rod respond to intensity of light where as cones respond to colour. due to genetic disorder some people do not possess cone cells and such person cannot diffrentiate colour but can see otherwise.and due to lack of cone cells there is no image formation
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