I'm a Systems Reliability and DevOps engineer for Netdata Inc. When not working, I enjoy studying linguistics and history, playing video games, and cooking all kinds of international cuisine.
In the dark, if you don’t know your setup well enough to find home-row by touch, then yes it can help. Depending on the key-caps themselves and the layout, it may also help if you need to find things you don’t type frequently enough that they’re muscle memory. In both cases, it’s usually better for visibility than top-illumination unless you have a lot of ambient light in the room that is a constant uniform color (that is, not glow from your monitors, but something like a light fixture).
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In the dark, if you don’t know your setup well enough to find home-row by touch, then yes it can help. Depending on the key-caps themselves and the layout, it may also help if you need to find things you don’t type frequently enough that they’re muscle memory. In both cases, it’s usually better for visibility than top-illumination unless you have a lot of ambient light in the room that is a constant uniform color (that is, not glow from your monitors, but something like a light fixture).