Blindness resulting from retinal detachment surgery

[kll1350]

I recently had bilateral detached retinas. Rt was macular off and left significant tear but macular still on.  Both eyes were done during same surgery under general anesthesia, no nitrous that I know of. Left eye full buckle installed and tear treated with cryotherapy and 0.35 cc 100% SF6 installed. IOP was 25 mm post op with good perfusion. Rt eye had vitrectomy and cryotherapy used and 39% FSX gas inserted.  When bandages removed next morning left eye had NPL.  Rt eye has returned to 20/100 corrected after second RD surgery and now has partial buckle. Dr mentioned cherry red spot visible in left eye during initial post op exam at time of NPL diagnosis. Has been noted that blood pressure dropped to 70/30 at conclusion of surgery on left eye and before beginning of surgery on rt eye. I was in excellent health prior to surgery, no risk factors (BP typically 110/75, no diabetes, no heart problems, no vascular problems)for embolism and carotid doppler indicated all was good.  Could the low blood pressure have been insufficient to keep the optic nerve and retina perfused?  What would critical BP need to be.  Neuro ophthalmologist I saw last month seems to believe both the optic nerve and retina were damaged separately.  Neuro says retina arterial supply is absent and optic nerve color is pallor.  Could the low blood pressure be the cause?  If not what should I be looking for. I need cataract surgery on remaining eye and will not have it till I know what happened.