After reading carefully about the question on internet and how other have fix their glass' frame, It is known that acetate frames (or any other thing made of Acetate) can be "melt" using Acetone. You must be sure that your frame are made of pure acetate, which was my case.
- I dipped both broken parts into acetone for about 2 minutes
- I sticked them together with little bit of hand pressure during 1 minute or so
- Then, I carefully placed my frame on a flat surface
- 24 hour later, it has sticked and really, it's hard as it used to (even more I think).
- With my finger, I just flattered surface with a bit of acetone to make it soft and TADAM!
But Warning : Be careful because in my case, because it was related to glasses, it is really not recommended to do this for a long time usage. Do this for a "temporary" repair until you buy some glasses back really soon. Angles are really important in case of prescription glasses. Unless you are a professional and/or you have correct tools, you are not able to replicate the exact angle as your frame had for your very needs.
Also, carefuly handles acetone... it is known to be toxic. Wash you hands and frame once you finished.
Source : https://www.youtube.com/watch?v=lu9v5UffIJ0