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Characterization of working and mobile use distances in common users of electronic devices and computers

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First Author: D.Pinero Llorens SPAIN

Co Author(s):    F. Soler   A. Sánchez-García   A. Molina-Martin   D. de Fez   V. Díaz   N. López-Gil     

Abstract Details


To analyze and characterize the pattern for working visual and mobile usage distances for common users of electronic devices and computers.


Fundación Dr Soler de la Comunidad Valenciana, Elche, Alicante, Spain. Department of Optics, Pharmacology and Anatomy of University of Alicante.


Transversal study resulting from a screening campaign evaluating the visual status of professionals working with computers or electronic devices more than 2 hours per day. A total of 100 patients were revised with a mean age of 41.2 years, ranging from 20 to 62 years. A battery of screening tests was performed to all participants in a single session at the working environment of each of them, including measurement of the working distance (WD), arm length, and mobile phone usage distances (MPUD).


The WD was significantly longer than MPUD (61.22±12.35 vs. 32.22±6.35 cm, p<0.001). Likewise, MPUD was significantly shorter than the arm length (74.44±4.65 cm, p<0.001). A total of 4% and 91% of patients had a WD and MPUD of 40 cm or below, respectively. A weak although statistically significant correlation was found between WD and MPUD (r=0.387, p<0.001), and between WD and arm length (r=0.260, p=0.009). Statistically significant differences were detected among job groups in WD (p=0.021), being longer for militaries compared to university researchers and lecturers (p=0.025).


Working and mobile phone usage distances vary significantly among common users of computers and digital devices. Near visual acuity measurement at 40 cm may be an inadequate test in these patients to evaluate if the visual performance achieved by them when implanted with multifocal IOLs is optimum.

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