called me today too..left no message caller ID said research. Called the number and recording and said Police International doing research on glaucoma and dry eyes.   Yea ..right!
I see most on this list were in April 2013...I just got mine in April 2014

Didn't answer the call. Read the comments here. Called the number back and got a recording that let me have our # removed (took 30 seconds or more to get to that). "Police Int'l" looking for participants for a dry eyes study.

never ever ever ever answer these calls or give them any info about anything!

30 will fill up fast.  Look for 250 blocks from the same brand.

Don't ever call back these SCAMMERS.