Accommodative load from handheld game consoles in kindergarten children

Area of Science:

• Ophthalmology
• Pediatric Optometry
• Human-Computer Interaction

Background:

• Children's visual systems are still developing.
• Screen time and its effects on young children's vision are a growing concern.
• Assessing visual accommodation is crucial for understanding visual strain.

Purpose of the Study:

• To compare the visual accommodation responses of young children to different image sources.
• To evaluate the impact of screen type (backlit vs. non-backlit) and image contrast on visual effort.
• To determine the legibility and potential visual strain associated with older non-backlit game consoles.

Main Methods:

• 13 kindergarten children (4-5 years old) participated.
• Visual accommodation was measured while viewing a drawing, a color backlit game console (CBGC), and a non-backlit game console (NBGC).
• Statistical analysis (ANOVA, Scheffe test) was used to compare accommodation power across targets.

Main Results:

• The non-backlit game console (NBGC) required significantly stronger accommodation (2.26±0.50 D) compared to the drawing (1.75±0.52 D) and color backlit game console (1.82±0.61 D).
• NBGC had a considerably lower contrast ratio (1.1) than the drawing (3.1) and CBGC (3.4).
• Significant differences in accommodation were found between NBGC and the other two targets, indicating poorer legibility for NBGC.

Conclusions:

• Older non-backlit game consoles present a higher visual demand for young children.
• Low contrast and poor resolution on screens like the NBGC contribute to reduced legibility and increased accommodative effort.
• Findings suggest potential visual strain risks associated with prolonged use of low-contrast, non-backlit screens by children.