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I googled it and this is what I found.

Quote:

Here’s the point: blind people, and only blind people, are entitled to a continuous period of disability, which is sometimes referred to as a “disability freeze.” Basically this means that a record is made of the date when you became legally blind under the Social Security Act, and this determination can become a critical factor when the Social Security Administration computes either retirement or disability benefits in the future.
Actually one of the most important reasons for the disability freeze is to protect an individual whose earnings decrease after becoming blind. This is not an issue if the person becomes a beneficiary, because the period of disability (or freeze period) is established at that point anyway.

You can read the article here

http://nfb.org/legacy/bm/bm01/bm0111/bm011104.htm