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Ask HN: Why were green and amber CRTs more comfortable to read?

CalvinBuild Tuesday, February 17, 2026

I have been looking into how early CRT displays were designed around human visual limits rather than maximum brightness or contrast.

Green and amber phosphors sit near peak visual sensitivity, and phosphor decay produces brief light impulses instead of the sample and hold behavior used by modern LCD and OLED screens. These constraints may have unintentionally reduced visual fatigue during long sessions.

Modern displays removed many of those limits, which raises a question: is some eye strain today partly a UI and luminance management problem rather than just screen time?

Curious what others here have experienced:

Do certain color schemes or display types feel less fatiguing?

Are there studies you trust on display comfort?

Have any modern UIs recreated CRT-like comfort?

Full write-up: https://calvinbuild.hashnode.dev/what-crt-engineers-knew-about-eye-strain-that-modern-ui-forgot

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