Here is the list of everything Hasbro will have to offer in regards to Star Wars: The Force Awakens. The Black Series Die-cast are an eyebrow raiser. I have seen pictures of a few things and got vague descriptions of case breakdowns on others. Amazon put our a blast pulling everything EPVII.
However, vision will not be clear. Wearing the incorrect vision prescription will not cause vision to worsen, but a person may experience eye strain and headaches as an effect of the wrong prescription. The front of the eye, called the cornea, may have a slightly different shape for many people.
Anything worse than 20/200 that cannot be improved with corrective lenses. I have asked that same question. Of course, the severity of your prescription tells you how bad your eyesight is. I believe mine is -4.75 at this point, and my eye doctor has told me that I am legally blind.