User-selected display placement for young computer users (prepresbyopes)and older computer users with
presbyopia, wearing multifocal lens correction, has been observed in field settings, but not while both
groups used the same display size or illumination technology. A field study was conducted to examine
placement of an 18.5-inch, widescreen LCD display for prepresbyopes and presbyopes using multifocal
lens correction. Both groups viewed the 18.5” display for four days as they performed their usual
computer tasks at their workstations. Multifocal wearers selected a display height that was lower than
computer users who did not have presbyopia. As a result the eye-to-screen angle for presbyopes was
significantly lower than prepresbyopes. The findings potentially affect proper design and selection of
adjustable display supports. Measuresof gross body posture and text size were also collected. Multifocal
wearers did not choose seated postures different from prepresbyopes. Additionally, the majority of both
groups viewed text at arc angles smaller than ANSI/HFES 100-2007 and ISO 9241-3 recommendations