How much screen time is too much?

More than 1-2 hours per day is a lot especially for phones, tablets and TV. Laptops/computers these days are used by all for their work and study which goes up 6-7 hours per day. There's no stopping for that unfortunately, but you can take small breaks of 10-15 minutes in between to relax your eyes and do some light eye movements/exercises to decrease the strain on them.

Probably less than you are already on-screen or, an “hour a day” and, ideally that will also include a couple of proper visual breaks looking at something more than 20 ft or 6 mtrs away to give both of your eyes (binocular 3D vision a break) from up-close convergence and accommodation required to make sequential, serial, fixation and saccades on a standard black text on a white background / contrast screen. The average person can sustain intense activity for up to around 90 minutes before fatigue sets in however, as our eyes are working all the time we are awake, it is not rocket science nor counter intuitive to realise that, over-exposure to the near and close-up in the 21st Century, exacerbated by display screen use / operation, has resulted in a Global Pandemic (WHO ICD-10) of binocular 3D eye-strain that, if ignored will predictable result in visual repetitive stress injuries manifesting in myopic and/or asthenopic stress related adaptations, blurred or double vision. 19% of teenagers in education are now presenting with visual disruptions affecting their capacity to read fluently & increasing the risk of errors, mishaps and accidents. Those classified as Neurodiverse will classically be at a far higher risk of deficits. In the workplace this is commonly known as CVS (Computer Vision Syndrome) or Screen Fatigue and dismissed as “temporary” nevertheless, 58% plus of DSE workers will be at a 4 to 7 fold increased risk of induced binocular vision loss as most carry-on regardless, in affect self-harming and also increasing the risk of WRULD’s / MSD’s. However, adapting, customising or optimising your standard display screen interface ergonomics, the risk of early onset eye-strain maybe reduced as “accessibility” is improved by subjective or objectively changing the screen contrast colour settings.