Question

Suppose that a person is presbyopic. Therefore, when he observes a far away object (without corrective eyeglasses), the rays from the object would form an image at a point before the retina. But, when he is looking at a nearby object, the rays from the object converges as if they are going to meet at a point behind the retina. Therefore, if we visualise how the image is formed on the retina, the image would be inverted in the case of looking at a distant object, and the image would appear erect while looking at a close by object (since the rays haven't crisscrossed each other, it remains erect). It seems as if the person sees a distant object erect, while a nearby object would appear relatively inverted. But this is not the case. Why?

Answer 1

Firstly we never see an inverted image of an object irrespective of the position of the object because our eye acts like a simple camera.
Eyes have a converging lens and image is projected on the retina after the light rays being converged by the eye lens and cornea. So if the rays do not fall on retina we do not see an object. As because a virtual image cannot be projected on a screen so if we place the object too near to the eye, that is between the focus and the pole we see a blurred image. In any other places as well, a real image is formed on the retina. Most importantly even if some virtual image is formed by the eye lens we can never see them.
Secondly, all images that falls on retina are real and inverted but our brain interprets inverted images in the retina as straight.