Question

Why we can�t see things very close to our eyes?​

Answer 1

Answer:

If an object is placed very close to the eyes the light reflected from it does not fall on the retina. It either falls in front of the retina or behind it or on the blindspot. Hence, we cannot see the object. The minimum distance for seeing an object clearly is 25cm.

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Answer 2

Answer:

When you are young, the lens is very pliable and it allows you to change the focus over a wide range of distances. To go from a focus of "infinity" to 25 cm, you need to be able to change the refractive power of the eye by 4 diopters. That's typical for a healthy young eye - but there are two things that can change where you comfortably focus.

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