I have used autologous serum eye drops which sound similar if not the same - made from your own blood with the red blood cells taken out.
They are expensive. I would still be on them if it weren’t for my blood phobia. If I can get over the blood phobia then I may go back on them.
Which company makes the PRP drops? The company I have used for autologous serum eye drops is Vital Tears, I think they are the only company in the US that makes them.