Focus­ing the brain on bet­ter vision (The New York Times): “As adults age, vision dete­ri­o­rates. One com­mon type of decline is in con­trast sen­si­tiv­i­ty, the abil­i­ty to dis­tin­guish gra­da­tions of light to dark, mak­ing it pos­si­ble to dis­cern where one object ends and anoth­er begins. But new research sug­gests that con­trast sen­si­tiv­i­ty can be improved with…