You seem to be suffering from myopia
.myopes have weak retina
and large eye balls. Posterior vitreous detachment
is known occurrence in myopes , you will have to be always watchful about sudden increase in floaters
, flashes and sudden fall in vision. Consult a retina specialist annually or if ever these symptoms occur. Avoid injuries to your eye or sudden heavy weight lifting. Presently get a retina consultation at your ease if you have not done that yet.