sight test, if the person who is being tested can recognise a test symbol that has a line width of less than 1 minute of arc, then their visual acuity will be 1. If the person being tested has a visual

specific gesture (double tapping with three fingers) to invoke the zoom with iOS leads to confusion less often than with the Windows phone, where double tapping with two fingers often invokes elements u

long-sightedness. What is a vision defect? An eye is described as having a vision defect when it has less than normal vision. The term is very imprecise, as a vision defect can have a wide variety of causes