The USA has several laws regarding accessibility of resources, both physical and electronic, with regards to persons with disabilities. For this reason, popular operating systems such as Windows, OSX, and Android all have settings to help people who are hard of hearing, have poor vision, color blindness, inability to press certain key combinations, or another disability relevant to computing. However, I am specifically interested in how these laws apply to video games under U.S. law.
The Americans with Disabilities Act of 1990 and Communications and Video Accessibility Act of 2010 are two examples that both help to ensure that persons with disabilities have access to communications systems and software (this question is not limited to the scope of those two laws, they are simply prominent examples). However, I have had a difficult time finding out exactly what this means and what means are used to determine if a particular piece of software must abide by the terms of the laws. The searching I have done has resulted in either information locked behind paywalls (e.g. papers in journals) or walls of text of legalese.
For example, I can gather that the PlayStation 4 itself (hardware plus operating system/shell) are now required to take measures to be accessible. This appears to be primarily because the system does more than simply play games: one can use it to browse the internet, play music, stream TV shows and movies, etc. It is, in effect, an appliance that can not only play games but also be used for general content consumption.
However, common sense would tell me that games designed for PlayStation VR would not be required to take measures to be accessible to the vision-impaired. That is the issue I have: common sense and intuition tells me this, not a law or a summary of the law written for laymen. I am not sure what specific legal test applies to software in this case.
The same applies to PC video games, and some PC software clearly must be accessible else disabled people be left behind in the digital age. Again, common sense tells me that a web browser or word processor must be accessible, but Skyrim might not: however, I am not sure what the law has to say about this.
What got me thinking about this was a reddit thread about Factorio. I am not asking if the laws apply to the scenario in that thread, I am asking what criteria does U.S. law have to say about video games sold or distributed in the United States' jurisdiction?
How would I, as a legal layman, be able to tell with reasonable certainty if or how accessibility laws in the USA apply to video games or other software designed purely for entertainment purposes?