i know it can be annoying to hear, but rule out medical before turning to the magickal.
if you have seen a doctor and your eyes are fine, it could be a spirit, maybe a faerie or any number of astral beings. it's really hard to determine from an orb [though certain beings more commonly have specific colours] reflect on the orb, how did you feel when you saw it? did it appear in certain situations [were you nervous, jealous, happy, reflecting] did you see the orb the next day or day after? if so, try speaking with it, or meditating [pendulum work might also help] to see if it is anything that's simply visiting. with the veil so thin it could be just a wandering spirit. did any loved ones die this year? [pets too] it could be them checking in on your before returning to summerland or where ever.