This segues beautifully into a longer discussion about visual acuity testing charts. It's relevant because even today many VA charts still feature the historic

This segues beautifully into a longer discussion about visual acuity testing charts. It's relevant because even today many VA charts still feature the historical numbering systems which are deeply inconsistent from eye chart to eye chart. (The reason why this fault is of no concern is because in modern use, they are only stated to infer a vague acuity.)