Can't. There is no medical exemption in the vehicle code for window tint, and a doctors note has absolutely zero legal meaning. IF there is a medical necessity, the VC does authorize a driver to use a "removable sun shade" provided that it is removed during vehicle operation at night, refer to 26708(a)(10) CVC:
(10) Sun screening devices meeting the requirements of Section 26708.2 installed on the side windows on either side of the vehicle’s front seat, if the driver or a passenger in the front seat has in his or her possession a letter or other document signed by a licensed physician and surgeon certifying that the person must be shaded from the sun due to a medical condition, or has in his or her possession a letter or other document signed by a licensed optometrist certifying that the person must be shaded from the sun due to a visual condition. The devices authorized by this paragraph shall not be used during darkness.

. Then I got a "non-correctable" violation that basically meant I was forced to pay the ~$200 fine but wasn't forced to remove the tint. I did anyway since I paid all of 20 bucks for it.
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