From one of the listservs I’m on:
The National Research & Training Center (NRTC) on Blindness and Low Vision at Mississippi State University maintains an online participant registry for those interested in participating in research that seeks to enhance employment and independent living outcomes for individuals who are blind or visually impaired. If you would like to sign up or read more about it, please visit this link: tiny.cc/participant-registry. Signing up should take less than 10 minutes, and you will be asked to provide basic information about yourself. Researchers at the NRTC will use this information to determine your eligibility for particular projects, and to inform you about projects that may be of specific interest to you. Some of the projects provide small incentives, and other projects involve volunteer participants. If you have any questions, please call us at 662-325-2001 or toll free at 1-800-675-7782 or email email@example.com.
I haven’t checked it out yet myself, but the message came through a NFB listserv, so I assume it’s legitimate.