I went Dubai in 2003 on transist visa I came out form dubai Airport and started work there. After 2 years police caught me and send me back in paksitan on outpass. After 1.8 years I went again in dubai on visat visa but dubai immgration stop me in the airport because of eye scan. Now I am on Oman on a emplyment visa. My question is can I go dubai for changing visa?? Please let me know

They take people who violate their visa and laws seriously in Dubai... I highly doubt they will ever let you back anytime soon. You are almost certainly on their blacklist. You aren't a Dubai citizen... and you have no visa to be allowed to even work in Dubai... why would you have to go to Dubai for anything VISA related? If you are blacklisted in Dubai, then Dubai won't be issuing you one.