I heard that dream lenses pushes your eyes so that it is not so curved anymore. is this true?

True: Orthokeratology uses a series of contact lenses worn at night to flatten the cornea. It is a non-surgical method to treat low levels of nearsightedness. However, if you stop wearing the lenses for a length of time, the cornea reverts back to its original shape. There are some risks to infection associated with the overnight use of contact lenses and generally a series of lenses are required.

Yes: Orthokeratology works by wearing hard contact lenses when you sleep, allowing you freedom from contacts during the day. The contacts squeeze the cornea into the shape needed to provide you with your sharpest vision. Once the contacts are removed, the cornea starts to slowly go back to its normal shape. This is not a permanent vision correction solution, and you must be able to tolerate contacts.