Request for participation in glaucoma study

Scam scam scam wonderful SCAM!  We get LOTS of scam calls, and this appears to be yet another one.  Doesn't matter what this particular scam is, the lies may change but, but they are always annoying.  Every few weeks the scammers change out the numbers that they pretend to be using (and so this is a new one for us).  Lately, the scammers been using a series of phone numbers that match up with local businesses OR local residential phone numbers.  We also get the calls in batches, which makes it obvious that a variety of scams are all connected.  Wish that blocking, and never answering unknown numbers would cause a decrease in such calls, but NOT so.  

As a retired professional researcher I take particular exception to company's using "research" or "resrch" in a selling situation or randomly.  It makes attempting to do real research much more difficult.  

Recording said some kind of policeman group - hung up

they called today..said research study..for dry eyes.  Sound like another scam as reading their answer has been different on other callers....some gout or cancer...yea right.