text: what kind of tumor that press down on the optic nerves that causes blindness and what type of treatment is req   http://www.jonathanborden-md.com/optictumors.html  link to a medical web site explaining what you asked  there is a list of types of tumors and surguries  orbital tumors, tumors of the optic canal, superior orbital fissure and sphenoid wing, tuberculum sella meningiomas, pituitary macroadenomas, craniopharyngiomas...etc   this web site pretty much explains it all...i found it pretty interesting anyway