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