Digital Accommodative Asthenopia. Results of the Screening Study of Subjective Manifestations of a Multidimensional Psychometric Scale in On-line Mode. Message 1

Purpose: to investigate the nature, intensity and frequency of the main subjective manifestations of digital accommodative asthenopia online, to determine their relationship with basic ophthalmoergonomic indicators. Design and research methods. The online screening study was conducted on 1310 students (average age 21.5 ± 0.1 years; 75.3 % of respondents were female, 24.7 % were male). The psychometric scale used contained 25 items from 5 questions reflecting the main symptoms of accommodative asthenopia, as well as ophthalmoergonomic questions. Results and discussion. The average work experience with mobile screen devices (MSD) was 10.29 ± 0.1 years. At the same time, the average daily duration, as well as the one-time duration of using the digital television, varied widely up to 1 hour and more than 6 hours. The average distance from the eyes to the screen was 36.0 ± 0.5 cm (from 5 to 120 cm). Complaints of varying intensity and nature were expressed by 74.6 % of respondents, with the maximum rating of “constantly” and “very strong” in the percentage of respondents: difficulty focusing at a distance (5.6 % and 5.7 % of respondents, respectively), eye strain when looking at the screen — 2.3 % and 2.7 %, fogginess and blurriness — 1.7 % and 1.2 % of respondents. There were no significant correlation between the length of use of devices and complaints of accommodation problems among the respondents surveyed. A positive weak but significant relationship was found between the indicators “duration of using the digital optics and digital electronic devices per session” and “duration of using the digital optics and digital electronic devices during the day” with complaints of strain when fixing the gaze on the screen, as well as with blurred vision and problems focusing into the distance. The absence of a significant correlation between the length of use of devices and accommodative complaints may indicate the inclusion of some kind of stable, reliable mechanisms of accommodation compensation by the type of long-term adaptation, masking the subjective manifestations of the digital accommodative asthenopia. On the contrary, complaints of accommodative asthenopia associated with the duration of use per session or during the day reflect urgent, “emergency” compensation mechanisms and are manifested more clearly in the form of corresponding complaints of visual discomfort. Conclusion. A conclusion is made about the adequacy and effectiveness of the methodological approach using a multidimensional scale in on-line mode for analyzing the subjective manifestations of digital accommodative asthenopia. The data confirm the important role of ophthalmoergonomic factors in the formation of digital accommodative asthenopia in information technology users.