Exploring cognitive overload in adults with visual impairment: The association between concentration and fatigue.

Significance: This research contributes to the concept of cognitive overload and the association between concentration and fatigue in individuals with visual impairment (VI). Gaining more insight into these and other factors explaining cognitive overload is essential for a better understanding, prevention, and treatment of fatigue severity in individuals with VI.

Purpose: Individuals with VI need to use additional cognitive resources to compensate for their loss of vision. These cognitive demands include increased concentration, which may put an extra burden on energy levels. This study aimed to expand upon previous research on the concept of cognitive overload by exploring the relationship between concentration and fatigue severity in individuals with VI.

Methods: A cross-sectional study was conducted based on data from the eligibility screening of the E-nergEYEze trial (n = 213). Concentration problems were measured with the Checklist of Individual Strengths subscale Concentration, and fatigue severity was measured with the Checklist of Individual Strengths subscale Fatigue Severity. Linear regression analyses were performed to investigate the association between concentration problems and fatigue severity. Potential effect modifiers (i.e., sociodemographic and vision-related characteristics) were considered, and associations were corrected for confounding.

Results: Concentration problems were directly and positively associated with fatigue severity ( β = 0.47; R2 = 0.10; 95% confidence interval, 0.28 to 0.66; adjusted model: β = 0.52; R2 = 0.16; 95% confidence interval, 0.32 to 0.72). No relevant effect modifiers were identified. However, other factors that were not included in this study were involved in this association.

Conclusions: This study contributes to understanding the cognitive overload as experienced by adults with VI and highlights the importance of the association of concentration problems, as a reflection of the cognitive burden and perceived fatigue. It is recommended to identify and address concentration difficulties through suitable awareness and treatment strategies to prevent and reduce severe fatigue in this population.