What does “good vision” mean?

Vision is a complex sense with many parameters. To describe someone’s
vision as good or normal, having a high resolution (visual acuity) is
not enough. It should include the correct color perception, a good
sense of depth (stereoscopic vision) and normal range and coverage of the visual field.

In daily practice, the first thing we check in an eye examination is the
"correct visual acuity", i.e. the best possible resolution
that can be achieved with the use of glasses or contact lenses.

In this sense, an eye that only has a refractive error, which can be
fully corrected with glasses, is considered as "healthy"
and it shouldn’t be believed that a child has a poor vision simply because it needs glasses.

A frequent parent’s question is whether glasses are therapeutic, i.e.
whether a child wears them, their glasses’ levels will be reduced
or whether the non-use of them will later lead to the need for
stronger lenses. The answer to this question is that the strength of
the lenses that we need is all about the construction of our eye and
thus is genetically predetermined.

In other words, the course of a refractive abnormality has nothing to do with the need to use
glasses.

Nevertheless, it is recommended that children wear glasses
given to them to ensure the fidelity of visual stimuli and to avoid
other problems for the proper development of the visual system of a
child, such as amblyopia and strabismus.