Melanocytomas are typically a benign meaning they can grow, but rarely transform into a malignancy.
Most optic nerve tumors (65 percent) are gliomas that occur somewhere along the anterior visual pathway.
Depending on the initial location of the tumor, visual loss may be accompanied by exophthalmos, extraocular motility Optic nerve melanocytoma does not usually produce symptoms or grow.
If they slowly grow, optic nerve melanocytoma can produce afferent pupillary defects (30%), subretinal fluid (10%), and an enlarged blind spot (75%).
[1] Growth can also cause compressive vascular problems like central retinal vein occlusion.