You should approach the Traffic Dept to ask for this permission to "Tint" your windows.

However and based on commentaries from an official in this Press Note Mobile phone use taking toll on roads: top official they are stating that users will have to prove a medical condition in order to tint their car windows

Regarding the use of window tinting, the director said that it can be fixed only for those with a medical report saying that he or she cannot be exposed to sunlight due to some disease. “For that, permits shall be obtained,” he added.

Regards!!