The clarity and comfort of printed text.
Wilkins
A J
AJ
Nimmo-Smith
M I
MI
D000328:Adult; D000368:Aged; D001248:Asthenopia / Q000517:prevention & control*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011327:Printing / Q000191:economics; D013782:Textbooks as Topic / Q000191:economics