We can have a more sophisticated use of metrics and if we must use aneyetest, use the coaches who have trained their eyes for decades and made their living analyzing teams.
Those who had not had aneyetest in the last two years were asked to state the reason, and most said it was because they did not have any problems with their eyes.
The RNIB says that children under 16 and adults over 60 should have an annual eyetest and the rest of the population should have one every two years unless they have been advised otherwise.
This kind of test may even find its way in an augmented-reality device like Google Glass by tracking eye movements as an image moves across the field of view, as a recently uncovered patent suggests.