How to Reduce Blue Light From Screens

Long days in front of a laptop or phone add up. Here are the practical, low-effort changes that actually make a difference to eye strain and evening screen use.

Start with settings you already have

Every modern phone, laptop, and TV already includes a built-in warm-tone mode, and it's free. On iPhone and iPad it's called Night Shift, on Android it's usually labelled Night Light or similar, and Windows has Night Light built into display settings too. Turning these on and scheduling them to activate automatically each evening is the single easiest change you can make.

Adjust brightness to match your room

A screen that's too bright relative to the room around it causes more eye strain than blue light itself. In a dim room at night, a screen blasting full brightness forces your eyes to work harder. Most people find comfort by matching screen brightness roughly to their surroundings — bright during the day, dimmer in the evening.

Consider blue-light filtering glasses

Blue-light glasses are widely available in NZ from opticians and general retailers like The Warehouse, typically ranging from $20 for basic filtering lenses up to $150+ for prescription pairs from an optometrist. The evidence on how much they help is mixed, but many people report less eye fatigue after long screen sessions, and they're a low-risk thing to try.

Follow the 20-20-20 rule

Eye-care professionals commonly recommend looking at something 20 feet away for 20 seconds every 20 minutes. This isn't about blue light specifically — it's about reducing the eye strain that comes from staring at a fixed close distance for hours, which is often the bigger culprit behind tired eyes than light colour alone.

Check your monitor's built-in eye-care modes

Many monitors sold at Noel Leeming and PB Tech, including budget models from brands like BenQ and Dell, now include a dedicated "eye care" or "low blue light" picture mode in their on-screen menu. These are worth switching on permanently for work monitors, since they're built into the hardware rather than relying on software settings that can get reset.

Mind your evening habits, not just your screen

Reducing screen brightness and colour temperature in the hour before bed helps some people sleep more easily, but the bigger factor for many is simply reducing screen time itself before bed, regardless of colour tone. If night mode alone hasn't fixed restless sleep, try pairing it with an actual wind-down period without any screen.

Set up your workspace lighting properly

Poor ambient lighting is an underrated cause of digital eye strain. A desk lamp that creates glare on your screen, or working in a very dark room with only your monitor lit, both make your eyes work harder. Aim for soft, indirect room lighting that doesn't reflect directly off your screen.

Know when it's something else

If eye strain, headaches, or blurry vision persist despite these changes, it's worth getting your eyes checked by an optometrist. Uncorrected vision issues are a common hidden cause of screen-related discomfort that no amount of blue-light filtering will fix.