In some embodiments, {HEAD ~ the optical properties} of {TAIL ~ at least one lenslet} are tunable 
In some embodiments , { HEAD ~ the optical properties } of { TAIL ~ at least one lenslet } are tunable
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH