Pretty amazing how a typical visit to an optometrist hasn't changed much in decades or even a century: Snellen eye charts from the 1860s, modern phoropters from

Pretty amazing how a typical visit to an optometrist hasn't changed much in decades or even a century: Snellen eye charts from the 1860s, modern phoropters from the 1920s, widely used tonometers from the 1950s. A branch of medicine can afford to stand still if we collectively resign ourselves to buying a new assistive device every year or two.