This is a complete optotype chart with tests for visus including children and near distance, color sensitivity and many more.
For optotypes graphics (Children / E Albini) the system is not displaying letters, but individual images positioned and sized according to the same criteria.
Using an on screen controller shown on the right side, the distance can be changed and then the visus values are recalculated accordingly. You can reverse the contrast or apply the red / green background to the chart
For Apple iPad. Compatible only with 10 inches models.