https://www.youtube.com/watch?v=QneGdfVK-ZQ (Video of flexible patch)
I couldn't find the right kind, so I designed this, it's concave so it won't touch the eye and is curved so it fits around the head.
Has some small vent holes for ventilation.
Needs supports while printing, be sure to sand and totally remove any rough edges before using this.
Added FlexEyePatch, this is for printing in flexible filament, it's also symmetrical and not as curved since the flexible filament will do the curving.