Emmetropia is basically normal vision, or a state of vision in which far objects are in sharp focus, with the eye lens in a normal state.
Emmetropia
lazy eye
word root
emmetropia
Emmetropia is when light is focused exactly on the retina and vision is perfect. Farsightedness is called hyperopia. This condition occurs when the eyeball is smaller than normal and light rays from near objects do not focus properly on the retina at the back of the eye. A person with hyperopia can see distant objects more clearly than closer objects.
The term for normal vision would depend on what aspect of normal vision you are talking about. The word for needing no correction because the lens correctly focuses on the retina, it is emmetriopia. The word for being able to see all colors is trichromatopsia.emmetropia
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Eyes work the same way regardless of the position of the head, and regardless of age. Of course, understanding what you see is another matter. I doubt that an upside down baby understands what it sees. But it does see. When they are first born, yes, we all see things upside down but our brains reverse the image. If you wear a pair of specially made spectacles that gives images upside down, for a few days you will see things upside down after you remove them until your brain can readjust to it. The reason for two answers to this question is the ambiguity of the question. Do you want to know if babies can see when they are upside down, or do you want to know if babies see an upside down image. You have an answer in either case.