Imran Khan's sons say they fear for their father's deteriorating health in a Pakistani jail and are seeking permission to visit the former prime minister, urging the authorities to grant access after more than two years apart, Reuters reported. 

Khan's lawyer told Pakistan's Supreme Court last week that the former cricketer had lost significant vision in his right eye while in custody. A medical board said on Feb 16 the swelling had reduced after treatment and his vision had improved.

Speaking to Reuters in London, where they are based, Khan's sons Kasim and Sulaiman, 26 and 29, said they were uncertain about the medical report. They spoke to their father on Feb 12 for the first time since September.