I have search through multiple threads for an answer to this, but I can't seem to fix it. I am having a problem where a face in my model is disappearing upon being imported to Unity. I checked my normals, and the face's normal is going the right way. I have attached the .blend file. Any help is appreciated! The face not showing up is the left eye when you are looking at it from the front. Thank you!
Try exporting it to an FBX file, and then importing it into Unity. It worked for me, and it seems like the .blend import is broken somehow.