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12 December 2017
- (diff | hist) . . Visual acuity; 04:57 . . (+24) . . 2602:306:346e:a070:1c2b:3b2e:466e:6be (reverting vandalism)
11 December 2017
- (diff | hist) . . Snellen chart; 11:21 . . (+868) . . Zzjlamb (Added the mathematical formula for calculation of the size of optotypes, with a reference.)