Reverse video is also sometimes used for
accessibility reasons. When most computer displays were light-on-dark, it was found that users looking back and forth between a white paper and dark screen would experience
eyestrain due to their pupils constantly dilating and contracting.
Flicker was also an issue with early white-background displays. Today, people with visual impairments such as
ocular toxocariasis may find it less tiring to the eyes to work with a mainly black screen, since modern operating systems usually display a lot of white in a normal use. For the same, white-dominant reason, reverse video is an efficient way to read or write text in a dark environment, since the darkness of the screen may blend into the darkness of the environment. A number of operating systems, graphical programs, and websites offer
dark modes, which serves a similar purpose as what was originally true video and is now reverse video in modern systems. ==References==