According to a recent study reported in Optometry & Vision Science font size plays an important role in determining productivity. It is known that for the printed page reading speed increases with print size. But is this true for reading from computers with added glare and other potentially impactful computer screen parameters?
Peiye et al (2014) studied young (18-35 year-old) and older (55-65 year-old) participants in their study and found that indeed the same relationship exists. They went further and quantified the relationship. Each 1 mm increase in font size led to a mean productivity and accuracy improvement.
Adding reflective glare on the monitor surface led subjects to move their heads forward but had no effect on productivity or accuracy. Age (with appropriate corrective lenses) had no effect on these relationships.
Their study suggests productivity and posture of computer users is enhanced with larger than typical font size.