I guess I shouldn't leave you hanging like that. Arcus is harmless - it that's what you have - but sometimes can be seen with higher serum lipids but usually it's just a family trait. It usually looks like a whitish haze around the peripheral cornea.
MJK MD
Look up arcus senilis - this is the most likely possibility. Rarely a copper storage disease - Wilson's disease can cause copper deposition in the peripheral cornea but usually only visible with microscope and it's rare and I doubt you would be able to notice it.
MJK MD