hi, if i try to use dynamesh the eyes (just merged with the body) deforms. I try to dynamesh using also max resolution but the eyes still deforms like in the image, thanks for the attention 
Hello @nutellino_67
Be sure to upgrade to the most recent version of Zbrush. It’s free for registered users, and outdated versions aren’t officially supported.
You must increase the dynamesh resolution to capture finer detail. Meshes that are abnormally small in the worldspace may have trouble generating enough resolution for fine detail. You may be able to increase the mesh’s resolution potential by increasing its size in the worldspace.
However, Dynamesh is intended for work on meshes at the low to medium/medium-high detail level, and you will eventually reach a point where you can no longer capture finer detail. When this happens, you will need to transition to a multiple subdivision level process, and subdivde your mesh up to the required level for the detail you want to sculpt.
Making the eyes a separate mesh from the skin will also allow you to avoid the appearance of stretched polygons where the two surfaces meet, regardless of mesh resolution.