Is there a &quot;da da da da da da&quot; sound when you focus on something?<p>The article makes the thing seem like 100% upside.  While that would be great, I&#x27;m wondering things like &quot;How long does it last,&quot; and &quot;What&#x27;s the complication rate for the procedure,&quot; and &quot;Does it work equally well at all distances?&quot;