California Code, Health and Safety Code - HSC § 1367.4

No plan issuing, providing, or administering any contract of individual or group coverage providing medical, surgical, or dental expense benefits applied for and issued on or after January 1, 1986, shall refuse to cover, or refuse to continue to cover, or limit the amount, extent, or kind of coverage available to an individual, or charge a different rate for the same coverage solely because of blindness or partial blindness.

“Blindness or partial blindness” means central visual acuity of not more than 20/200 in the better eye, after correction, or visual acuity greater than 20/200 but with a limitation in the fields of vision so that the widest diameter of the visual field subtends an angle no greater than 20 degrees, certified by a licensed physician and surgeon who specializes in diseases of the eye or a licensed optometrist.