The shallow rabbet has a forward rabbet wall spaced from the front surface of the eye rims and the bridge, and {HEAD ~ a saggital rabbet wall}, which is substantially longer than {TAIL ~ the forward rabbet wall} 
is substantially longer than
The shallow rabbet has a forward rabbet wall spaced from the front surface of the eye rims and the bridge , and { HEAD ~ a saggital rabbet wall } , which is substantially longer than { TAIL ~ the forward rabbet wall }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL