Effects of font size and reflective glare on text-based task performance and postural change behavior of presbyopic and nonpresbyopic computer users

Details

• Personal Author:
  Bailey I ; Ko P ; Mohapatra A
• Description:
  Nineteen young (18-35 year-old) and seven older presbyopic (55-65 year-old, wearing bifocal or progressive glasses) subjects with the same average visual acuity at near distance participated in this fullfactorial, repeated measures study with two trial factors: font size (capital letter heights of 1.78, 2.23, and 3.56 mm) and reflective glare. The monitor location was fixed, but subjects were allowed to move their bodies and the chair while performing visually demanding tasks. The productivity improved up to 30% when using a large font size (average visual angle 23.4 arcmin) compared to a smaller font size (14.2 or 16.4 arcmin, p < .0001). The relative contributions of torso flexion (78%), head forward (3%), and chair reposition (4%) to changes in the viewing distance remained constant across font size conditions. Reflective glare had no effect on productivity measures but led to reduction of viewing distance (p < .0001). There were no significant differences between the two age groups. [Description provided by NIOSH]
• Subjects:
  Aging Computers Eye Men Nervous System Occupational Health Safety Sense Organs Women
• Keywords:
  Age Groups Eye Glasses Eyes Eyesight Humans Psychophysiology Visual Aids Visual Fields
• ISBN:
  9780945289418
• ISSN:
  1071-1813
• Publisher:
  Human Factors and Ergonomics Society
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Proceedings
• Place as Subject:
  California ; Massachusetts ; OSHA Region 1 ; OSHA Region 9
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  56
• NIOSHTIC Number:
  nn:20047730
• Citation:
  Proceedings of the Human Factors and Ergonomics Society 56th Annual Meeting, October 22-26, 2012, Boston, Massachusetts. Santa Monica, CA: Human Factors and Ergonomics Society, 2012 Sep; 56:2378-2382
• Federal Fiscal Year:
  2012
• Performing Organization:
  University of California, Berkeley
• Peer Reviewed:
  True
• Start Date:
  20050701
• Source Full Name:
  Proceedings of the Human Factors and Ergonomics Society 56th Annual Meeting, October 22-26, 2012, Boston, Massachusetts
• End Date:
  20250630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:fec8e72252a7cf7324b0121a4f4c1176c490a758408e24f5b55d67b53950fd7fd8036f00399026c2e27879daab0d3c102393b151ebed625e0593bab7c60784a5
• Download URL:
  https://stacks.cdc.gov/view/cdc/202727/cdc_202727_DS1.pdf
• File Type:
  [PDF - 644.37 KB ]