Hi Ousaima,
did you check pages 121-122 in the [https://www.meta-health.net/tiki-download_file.php?fileId=2203|book] ?
Long- and shortsightedness (ambliopia/myopia) can have different physical mechanisms behind, one major one is ((Sensory - Eye Muscles|muscular)). There are many cases in which these could be bettered or reversed, my own mother learned to see without glasses with the help of retraining her eye muscles and her habits. Of course, also family habits can be reversed, especially when we see through the dynamics...
The strategy of nearsightedness is to shut out things that are out of one's control, whereas farsightedness makes you perceive a threat at a distance and prevents you to get stuck in details. A deviation of sight will often make you look away from a source of conflict. If we know the goal of the strategy, we can find better means to reach it!
If one is born with such a condition, I personally haven't had a case where it could be reversed by coaching.