Welcome to HCM
We understand your concerns
I went through your problem description and I suggest you not to worry much about it.
Instead start doing physical activities and exercise. You are just 17 and I hope you are healthy. This vision problem is out of dizziness
and dizziness is due to rush of blood to head. And this shows lack of exercise.
Atleast 20 to 25 sit ups daily and other physical exercises for one hour should help you. Don't worry.
Hope this clears your doubts. Available for further clarifications.