This photo taken on July 17, 2018 shows an Indian woman looking through an optical biometric reader that which scans an individual's iris patterns, during registration for Aadhaar cards (or unique identifier [UID] cards) in Amritsar. - India's top court on September 26 upheld the government's Aadhaar scheme, the world's largest biometric database, but imposed new restrictions on how the personal details of more than one billions citizens in the system can be used. (Photo by NARINDER NANU / AFP)