Low Vision: Research and New Developments in Rehabilitation
Preview
To simplify the description further and to tie the units to the metric system, Louise Sloan introduced the term 'M-unit' and defined it as: 1 M-unit subtends 5' at 1 meter or: 1 M = 1.454 mm (approx. 1/16 inch) Thus, the letters 'm' and 'M' replace ...