Assertion: eye chart's letter | /r/HasProperty | less contrasted
Facets:
value: with the white background
type: OTHER
value: gradually
type: DEGREE
Source sentences:
text: The Pelli Robson contrast sensitivity chart tests your ability to detect letters that are gradually less contrasted with the white background as your eyes move down the chart.
text: The Pelli Robson contrast sensitivity chart tests your ability to detect letters that are gradually less contrasted with the white background as your eyes move down the chart.