Please Clarify my doubts below

[Girish_]

Hi, my name is Girish. I have an F1 Visa Valid for next 2 years, but i am in India for past 10 months due to personal issues. I am applying for readmission for same university and course, do i need to apply for new F1 Visa and Sevis or can i ask for extension of my F1 Visa with new Sevis record..???

Regards,
Girish