I use glasses that have the power of -7 in both the eyes. can i undergo a zyoptix laser surgery?

Maybe: This would depend on the shape and thickness of your cornea. You may or may not be a good candidate for lasik surgery. I recommend a full consultation for a better evaluation to determine if you are a good candidate.

Very possible : It is very possible that you are a candidate for laser vision correction but a thorough evaluation for surgery involves more than checking your prescription.