豆豆的驗光工作室（岡山　台光眼鏡）

呎　　　　　  公尺　　　　　簡示　　　　　中心視力喪失之百分比
20/16             6/5                     1.2                                         0

20/20             6/6                     1.0                                         0

20/25             6/7.5                  0.8                                         5

20/30             6/9                     0.66                                       9

20/40             6/12                   0.5                                        15

20/50             6/15                   0.4                                        25

20/60             6/18                   0.33                                      35

20/80             6/24                   0.25                                      40

20/100           6/30                   0.2                                        50

20/200           6/60                   0.1                                        80

20/300           6/90                   0.066                                    85

20/400           6/120                 0.05                                      90

20/800           6/240                 0.025                                    95