Assertion: snellen eye chart | /r/CapableOf | do fellowship
Facets:
value: with snellen
type: OTHER
Source sentences:
text: In 1868, just six years after Snellen first introduced his first Snellen eye chart, Dr. John Green of St. Louis, who had done a fellowship with Snellen, proposed to replace the non-uniform steps with a uniform geometric (logarithmic) progression of 25 percent for each line.