https://resources.lupus.org/entry/should-i-get-my-car-windows-tinted-1

Should I get my car windows tinted?

Lupus Foundation of America

Resource Content

If you are especially photosensitive, and spend a significant amount of time in your car, it may be a good idea to have your car windows tinted. Generally, individuals that have a condition that precludes sun exposure can obtain a form from their local department of motor vehicles (or the state’s public safety department) to give to their physician to be filled out and signed by their physician. Standards and regulations may differ among states. You can contact your local department of motor vehicles for information in your state.