Visor is a Chrome extension developed by Nverba. It is a screen dimmer and reading aid that aims to help with fluency, eye-strain, concentration, and comprehension while reading.

With its overlays and point of focus feature, Visor can be particularly useful for users with visual perceptual difficulties such as Dyslexia, Scotopic Sensitivity Syndrome, and Visual Stress. Although the effectiveness may vary from person to person, some users have reported improvements in reading fluency, reduced eye-strain, improved concentration, and better comprehension.

Visor offers both traditional overlays and a point of focus feature. The overlays can help reduce visual confusions and the tendency to skip lines, while the point of focus feature tracks your mouse and provides full focus to the content being read, minimizing visual distractions.

This Chrome extension requires no special permissions and needs to be reactivated with each page load. Please note that Visor does not work on Chrome's start page, options pages, or the Chrome web store due to restrictions imposed by Chrome.

Overall, Visor is a helpful tool for those looking to enhance their reading experience and reduce visual distractions while using Chrome.