Invert colors purpose?

Wife just showed me if you goto to settings > general > accessibility > invert colors you can make your phone look like a photo negative. This may have been discussed before but I couldn't find it. If it has I am sorry, but I was just wondering what was the purpose of this, seems harder to read

Invert Colors Figma Community

Inverted color on canvas, not on dockers - General Questions

How to Invert Colors of Video/Photo for Free

How to Invert Colors in PowerPoint - Zebra BI

How to Invert Colors on a Picture: Premiere, iPhone and Android

How to Invert Colors in Clip Studio Paint – Tech Lounge

Invert and Hue - Pixelmator Community

A modern approach to complementaries. — Le Lapin dans la Lune

Invert Screen Colors in iPhone and iPad

How to Invert Colors of Video/Photo for Free

How to Invert Colors of an Image in Photoshop in 3 Steps

How To Invert Colors with Inkscape