Can temple filler cause blindness months later?

The probability of a complication occurring a month after treatment is as close to impossible; as possible. Nearly all complications will occur immediately and those that don't will be identifiable within the same day as your treatment.

Blindness, necrosis, and all other vascular occlusion-induced complications are the most scary of all. All of the vascular occlusion complications will be identifiable within the same day of treatment. The sooner any complication is treated, the better the recovery will be.

"In addition, can blindness be caused by compression of an artery?" Yes. If you stop blood flow to the eye or the visual center of brain; blindness will result. You will want to ask your injector about safety and blindness prevention specifically; ask them what are the most dangerous places to inject related to blindness and then ask them for as many before and afters of those places as you can see.