Sleep and eyesight threatened by mobile phones: the 20-20-20 rule to protect the eyes

Sleep and eyesight threatened by mobile phone use. The alarm for the health of the younger generation comes from the pages of the Journal of the American Medical Association (JAMA) with research published in March 2026 revealing that 77% of adolescents do not get enough sleep, with a worrying increase in those who get less than five hours of rest per night (up to 23%). This chronic 'sleep debt', often caused by prolonged use of devices at night, is dangerously intertwined with ocular health. The transition to a hyper-connected society has indeed turned our eyes into the most stressed terminals of the human body. What was once occasional fatigue is now codified as Computer Vision Syndrome (CVS) or Digital Eye Strain (DES), a condition that now affects 69% of the world's population, with peaks of 74% recorded in the last three years.

"The pandemic has massively introduced distance learning, frequent video conferences, the continuous use of smartphones and digital tools that are increasingly close to the eyes. Our hectic lives often prevent us from taking the necessary breaks - such as looking away, blinking or squinting more frequently - that are essential to prevent visual and musculoskeletal disorders,' explains Lucia Intruglio, President of the FNO TSRM and PSTRP National Register of Orthoptists Commission.

These health professionals have always dealt with so-called 'video screeners', as defined by workplace safety legislation. However, in the last year, attention has been extended to all categories of workers and the general population. Unfortunately, similar exposure also affects children, who should use such tools only when necessary and in an age-appropriate manner, as recommended by the Italian Society of Paediatrics. Recent CDC data show that between the ages of 8 and 10, an average of six hours a day is spent in front of a screen, rising to nine for adolescents. Blue light acts on melatonin suppression, altering circadian rhythms and worsening sleep. Exposure to displays with varying resolution and contrast forces the visual system into a constant accommodation effort, exceeding the physiological resistance capacity of the eye muscles and triggering chain reactions involving posture, stress and anxiety, with neck pain due to incorrect viewing angles.

Identifying CVS is no longer just a professional issue, but a daily clinical necessity. The complexity of modern vision requires a multidisciplinary and coordinated approach between different specialists. "Reducing visual discomfort requires true teamwork. In order to see well, it is necessary to: check the general health of the eye and of the lachrymal film (task of the ophthalmologist); assess the quality and quantity of binocular vision, which depends on correct correction of refractive defects, normal ocular motility, the ability to fuse images and keep them together even in difficult conditions, depth perception and contrast sensitivity (examination also included in the LEA and the responsibility of the orthoptist); choose a customised and appropriate optical device (role of the optician)," Intruglio further explains. This synergy is crucial as CVS often masks or aggravates uncorrected pre-existing refractive defects or ocular motility disorders that only emerge under prolonged stress. In addition to clinical intervention, the behavioural aspect is essential: "It is also important to take care of the lighting of the rooms and the workstation, adopting correct visual and postural hygiene habits".

Prevention comes through ergonomic awareness and the adoption of strict protocols, most notably the '20-20-20 rule'. Endorsed by the American Optometric Association, this strategy involves taking a 20-second break every 20 minutes of screen activity by staring at a spot 20 feet (about six metres) away. This simple exercise allows the ciliary muscles to relax, interrupting the accommodative effort. The ergonomics of the workstation remains a pillar: the screen should be 50-70 cm from the eyes, with the centre of the monitor about 10-15 cm below eye level to favour a natural viewing angle. New frontiers come from technology: studies from 2024 (Zhu et al.) explore the use of wearable sensors and artificial intelligence to monitor blink rate in real time, sending automatic alerts when visual stress exceeds the guard threshold. In conclusion, managing CVS in 2026 does not mean giving up technology, but balancing it with structured breaks, regular eye check-ups and proper visual hygiene, and a few extra hours of sleep.