Hi Zoe
A warm welcome to BTG I'm certain that you will find the site a useful place to visit we all offer help, support and friendship to each other its been a godsend to me during my recovery.
I don't know anything about Tersons but had a third nerve palsy in my left eye thankfully I proved the Opthalmics wrong and have recovered the majority of my sight in my left eye,
Look forward to hearing more from you.
Janet x