Royal Dental College

INTRODUCTION
In the current digital era, screens play a crucial role in everyday life, with children encountering digital media at younger ages than ever before.[1] Electronic devices have transformed the ways we learn, communicate, and access information. Nevertheless, mounting evidence indicates that excessive use of screen media can lead to serious long-term negative impacts on children's physical, cognitive, social, and emotional well-being, presenting a major public health issue.[2] Research shows that heightened screen exposure increases the
likelihood of childhood obesity, behavioral issues, sleep disruptions, and subpar academic performance.[3,4]
This review examines the multifaceted impact of screen time on child development, emphasizing both the potential risks and advantages of digital media usage. It serves as a crucial resource for parents, caregivers, and healthcare professionals. The objective of this review article was to perform a thorough analysis of the available evidence regarding the influence of screen time on child development, particularly focusing on Cognitive and academic growth, as well as physical, social, and emotional development. In today's world, children are introduced to screens at a very young age. Screen time is defined as the amount of time spent engaging with electronic devices like televisions,
Table 1: Various types of screen time users
The significant dependence of children on screen media has led to critical public health concerns, as it may negatively impact their cognitive, academic, social, emotional, and physical development, as well as their sleep, vision, reproductive health, and long-term well-being. (Table 2)
Cognitive and Academic Outcomes: Numerous studies suggest that extended screen exposure can have detrimental effects on children's attention span, language development, memory, and motor skills. Increased screen time has been linked to slower learning rates and a diminished ability to acquire knowledge, which can negatively impact academic performance. Moreover, excessive passive screen time, such as watching television, has been correlated with delays in language development and inferior academic results. Children between the ages of 5 and 6 who experience higher levels of screen exposure show diminished attention skills, a crucial cognitive ability for achieving academic success. Delays in the development of attention may result in long-term learning challenges. Additionally, high screen time during preschool years has been associated with reduced cognitive abilities, indicating that negative effects may start early and continue into later childhood.[5]
Social and Emotional Development: Prolonged screen usage has been associated with difficulties in social and emotional growth. Hinkley et al. indicated that high levels of screen time in children aged 2–5 years
computers, tablets, and smartphones for either entertainment or educational activities. This screen time can be categorized into various types based on the degree of interaction and intended use, including passive, active, educational, recreational, and background screen time. (Table 1)
correlated with diminished social skills.[6] Anderson et al. identified a notable link between violent media exposure and aggressive behavior in children. Furthermore, a meta-analysis conducted by Twenge and Campbell (2009) revealed a direct connection between screen time and depression in adolescents. Increased television exposure during the ages of 6 to 18 months has been linked to heightened emotional reactivity, aggression, and externalizing behaviors.[7] Video gaming, especially violent games, has been associated with elevated anxiety and aggressive tendencies. Sleep disturbances related to screen time, nighttime device usage, and dependency on mobile phones have been connected to symptoms of depression and behaviors associated with ADHD. Exposure to rapid and violent content activates dopamine and reward pathways in the brain, which may lead to behavioral dysregulation.[8] The psychoneurological consequences of excessive screen time include diminished social coping abilities and craving behaviors similar to substance dependence. The presence of smartphones in personal environments, such as bedrooms, blurs the lines between work, leisure, and rest, heightening emotional stress and adversely affecting mental health.[9] Preschoolers with significant television exposure exhibit lower social competence, cooperation, and self- control, while excessive use of social media fosters unhealthy social comparisons and diminished self- esteem.[10] Excessive screen time can have a profound effect on the physical development of children and

Types of screen time
Description
Effect
Passive screen time
Watching television or videos without interaction
Helps in limited cognitive engagement
Active screen time
Use of tablets, smartphones, computers, or video games requiring user
engagement
Helps in cognitive, motor and problem- solving skills
Educational screen time
Screen use for learning purposes such as
educational apps, online classes, or academic videos
Supports learning outcomes and skill
development especially when guided by caregivers or educators
Recreational screen time
Screen use for entertainment, including gaming and social media
Adverse effects on physical activity levels, sleep patterns and psychological well being
Background screen exposure
Screens operating in the environment while the child is engaged in other activities
Disrupts attention, reduces parent child interaction, negative influence on language and cognitive development
Cyndrella Saji,et al.: Adverse Effect of Screen Time on Child and Adolescent Development: A Review
adolescents. A decrease in physical activity results in weaker muscles, poor coordination, and fewer chances for developing gross and fine motor skills. Extended use of screens leads to poor posture, which can cause neck, back, and shoulder pain. The phenomenon known as "tech neck" and issues with spinal alignment are becoming increasingly prevalent among younger users. Sedentary behaviours associated with screen time are closely linked to weight gain, obesity, and unhealthy eating patterns, such as snacking while watching TV. Long periods of screen exposure can lead to digital eye strain, dryness, and discomfort. Additionally, exposure to blue light can disrupt circadian rhythms, negatively impacting sleep quality. Using screens before bedtime can interfere with melatonin production, resulting in shorter and poorer quality
sleep, which in turn affects growth, immunity, and cognitive abilities. Children may be particularly susceptible to RF-EMR due to their higher tissue conductivity and the longer cumulative exposure they experience throughout their lives. The greater RF penetration in relation to head size raises concerns about possible neurological impacts. Emerging research indicates that thermal and RF-EMR exposure from devices kept close to reproductive organs could hinder spermatogenesis and diminish sperm quality. Mobile phones, laptops, and tablets have been identified as potential factors contributing to the decline in male fertility.[11] There are many observed effects of excessive screen time on a child's overall development, influencing attention and concentration, language acquisition, memory and executive functions, academic performance, and early cognitive growth. (Table 2)
Outcome
Observed Effects of Excessive Screen Time
Attention and concentration
Reduced attention span and poorer focus
Language development
Delayed language acquisition, reduced vocabulary
Memory and executive function
Impaired working memory and decision-making skills
Academic performance
Lower academic achievement and learning difficulties
Early cognitive development
Reduced cognitive abilities in preschool-aged children
Table 2: Impact and outcomes of screen time on the development of child
Preventive Strategies to Reduce Screen Time
Parents and caregivers are essential in reducing the adverse impacts of screen exposure. It is important to set age- appropriate limits on screen time, encourage physical activity, outdoor play, and social interactions, ensure that media content is educational and suitable for the child's age, foster learning and strengthen parent-child relationships, make use of device restrictions and monitoring tools, model healthy screen behaviours, restrict device usage in bedrooms and during mealtimes, and promote responsible decision-making concerning screen use.[12] (Table 3)
Strategy
Description
Screen time limits
Establish age-appropriate daily limits
Content monitoring
Ensure media is educational and age-appropriate
Co-viewing/co-playing
Parents engage with children during screen use
Encouraging alternatives
Promote outdoor play and social activities
Parental controls
Use device-based restrictions and monitoring tools
Tech-free zones
Avoid screens in bedrooms and during meals
Role modelling
Parents demonstrate healthy screen habits
Table 3: Preventive Strategies to Reduce Harmful Effects of Screen Time
Recommendations for Healthy Screen Use:
The American Academy of Pediatrics (AAP) advises that children under 2 years should avoid media exposure entirely, while those aged 2 to 5 years should have their screen time limited to less than 1 hour per day. The AAP's Healthy Media Plan in Family highlights the crucial role of parental supervision. It encourages outdoor play and physical activity in accordance with age-appropriate screen time recommendations (for instance, the American Academy of Pediatrics suggests a maximum of 1 hour per day for young children), advocates for regular breaks to alleviate eye strain, and promotes correct posture and ergonomic use of devices. (Table 4) Additionally, global guidelines from the World Health Organization stress the significance of adhering to similar limits. [13]
Recommendation
Guideline
Age-appropriate limits
≤1 hour/day for young children (AAP guidelines)
Physical activity
Encourage regular outdoor play
Breaks during screen use
Follow the 20–20–20 rule for eye health
Ergonomics
Maintain proper posture and screen positioning
Night-time screen use
Avoid screens at least 1 hour before bedtime
Table 4: Recommended healthy screen use by AAP
Benefits and Risk of Screen Time
The various advantages of screen time indicate that high-quality educational applications and interactive media can have a beneficial impact on literacy and numeracy, stimulate creativity, provide instructional resources, promote social interaction, and enhance communication and creative growth. When utilized correctly, technology can aid in achieving educational goals; however, it is crucial to implement regulation and supervision to ensure well-rounded development. The dangers of screen time are linked to excessive usage, which can lead to numerous risks affecting the physical, cognitive, emotional, and social growth of children and teenagers. Extended periods of screen exposure have been consistently correlated with diminished attention spans and lower concentration levels, which may hinder learning abilities and performance in the classroom. High levels of screen engagement, especially with rapid or non-educational content, can adversely affect executive functions such as working memory, self- regulation, and decision-making abilities. [14] (Table 5)
Aspect
Benefits (Controlled Use)
Risks (Excessive Use)
Learning
Improved literacy and numeracy
Poor academic performance
Social interaction
Digital communication opportunities
Reduced real-life social skills
Emotional development
Educational emotional content
Anxiety, depression
Physical health
Limited benefit
Obesity, sleep disorders
Table 5: Benefits and risk of screen time
CONCLUSION
Screen time can have both positive and negative effects on child development, influenced by its duration, content, and context of use. Excessive exposure to screens is linked to various physical health issues, including headaches, eye strain, musculoskeletal pain, sleep deprivation, and decreased physical fitness, along with mental health challenges such as anxiety, depression, and low self-esteem. Using screens at night can worsen sleep problems and emotional challenges. Recent studies also indicate that mobile phone exposure may adversely affect male reproductive health. To foster optimal physical, cognitive, and emotional growth in children and adolescents, it is crucial to raise awareness, follow screen time guidelines, and encourage balanced digital habits.
 

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