In the setting of single or multi-fraction cranial radiosurgery, do you have different constraints for the dose to the optic tract just posterior to the chiasm, compared to the constraints for the chiasm?

I treat the post-chiasmatic tract the same as the pre-chiasmatic nerve segments in a single x-shaped structure. As for the optic striations, as they blend into the brain, they get treated the same as the rest of the brain.

I use the same constraint.