It's too easy to think the "web" is just for those who can see. On a personal note, my father-in-law has diminished vision, and is legally blind. To use the computer, he uses special software to "zoom" the entire screen, and invert the colors to "white on black". Browsing the web can be difficult for those web sites that aren't designed with accessibility in mind.
Karine Joly writes in University Business about this issue. Her article Web Accessiblity: Required, Not Optional reviews several important points. She writes:
Web accessibility isn't a nice thing to have. It's the right thing to do to provide equal access to all. It's the legal thing to do to comply with the Americans with Disabilities Act and Section 504 of the Rehabilitation Act. It's the smart thing to do to assure that your web content will be found by search engines. Google is the ultimate disabled user: It doesn't see, it doesn't hear, and it can't use a mouse. Yet, along with the other search engines and the social web platforms powered by algorithms, it will increasingly function as your eyes and your ears in the search for relevant information. Making an institution's web content accessible to all users will soon be a mere prerequisite to becoming findable in the overflowing stream of data, and ultimately visible on the web.I disagree with only the last point. Making an institution's web content accessible isn't "soon" - it's something all web sites need to do now.
If you maintain web sites, I urge you keep accessibility in mind. Can your web site be easily read by a screen-reader? Are images optional to the navigation and presentation of your site? Do you use high-visibility colors (black on white, etc.)?
Looking for a resource? Purdue University has posted their web accessibility rules online.