Seething eyebane caused the eyes of a creature who was touched by the caster to explode.
Upon explosion, acid sprayed from the eye sockets onto those within five feet (1.5 meters). Because the spell required the caster to be in touching distance to the victim, the caster was also sprayed with acid.
The spell only required somatic and verbal components. It also incurred a corruption cost in the form of wracking the caster's body.