An inherent risk to all those with websites is a requirement lurking around the corner and turning it’s nasty little head every now and then in a form of suit papers.
Yes, this is a real thing. Title III of the ADA prohibits discrimination against the disabled, including the blind and vision impaired in places of public accommodation. Below is a copy/paste portion of the law. Overtime since Title III was enacted courts have come to include the internet as public accommodation.
No individual shall be discriminated against on the basis of disability in the full and equal enjoyment of the goods, services, facilities, privileges, advantages, or accommodations of any place of public accommodation by any person who owns, leases (or leases to) or operates a place of public accommodation.
42 U.S.C. § 12182(a).
One of the beautiful things about a free market is that when a problem pops up often someone creates a solution. There are companies that will provide an ADA Compliant assessment to determine how far out of the law you stand and offer their services as a solution.
However you view this risk it is certainly something to be aware of as you go about your daily business activities.