These include stiffness of neck and trunk muscles (rigidity), slowness of movement (bradykinesia), and impaired balance. Unlike classic Parkinson's disease, tremor is rarely a prominent part of PSP.

“Eye conditions and vision impairment are widespread, and far too often they still go untreated,” says Dr Tedros Adhanom Ghebreyesus, WHO Director-General. “People who need eye care must be ...