While browsing the web I came across the below post which provides an excellent overview of some of the problems, experienced by blind computer users when using the internet. One of the annoyances which I face is the use of CAPTCHA by web sites. CAPTCHAS are designed to prevent spammers from bombarding webmasters with junk e-mail by introducing puzzles which must be solved prior to a person being able to register, contact or post on a web site. Unfortunately many of these are visual and screen reading software such as Jaws is totally unable to read the CAPTCHA. Consequently many blind people are locked out (or, at least severely restricted) when using key features on certain sites.
Solutions do exist. For example some sites contain an audio alternative to the visual captcha on which a visually impaired computer user can click, listen to the words and complete the captcha. However while this often works for me not all web sites have an audio alternative while people who are profoundly deaf as well as blind find it impossible to use audible CAPTCHAS.
The best solution I have discovered is Webvisum, a plug-in for Firefox. This contains a feature which allows blind computer users to send a captcha electronically and have it sent back to them (solved) within a very short period. The solved CAPTCHA can then be cut and pasted, by the blind person into the form and he/she can submit the form. In my experience Webvisum solves most CAPTCHAS but not all.
Webvisum only works with Firefox.
The link to the post mentioned above can be accessed at http://www.evengrounds.com/blog/challenges-of-blind-internet-users.