Is dark mode actually better for your eyes?

Quick answer

A hot take with over a thousand upvotes: light mode is far better than dark mode. It's easier to read and less harsh on the eyes.

The replies were a war. Here's what the evidence says.

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What the evidence says

The UK College of Optometrists said there's little published evidence that dark mode reduces eye strain, and no evidence screen use damages eyes.
In a 2021 study on night reading, dark mode reduced measured visual fatigue at night in a dim room, though people preferred light mode.
In a 2025 tablet study, visual fatigue didn't differ significantly between modes.

Where light mode fans have a point

Many people find dark text on a light background sharper.
Some readers say white text on black looks fuzzy.

What to do

Daytime, bright room: light mode is fine.
Night, dim room: dark mode may feel easier.
Turn brightness down and text size up.
Look at something far away every 20 minutes.

FAQ: questions people ask

Is dark mode better for your eyes?

There's little evidence either way for eye strain. One study found dark mode helped at night in dim light.

Is light mode easier to read?

Many people find it sharper, and studies found people often prefer it.

How do I reduce eye strain from screens?

Lower brightness, enlarge text, blink, and look far away every 20 minutes.