Snellen
Notation ------------LogMAR Chart ----------------- logMAR
20/100---- F N P R Z------ 0.4
20/80------------- E Z H P V -------------- 0.3
20/60----------------- D P N F R------------------- 0.2
20/40--------------------- R D F U V--------------------- 0.1
20/20------------------------ U R Z V H------------------------- 0.0
20/16-------------------------- H N V R D ------------------------- -0.1