Hertel type; has two footplates (or yokes) which fit over the bony temporal margin of the lateral orbital rim - one yoke is fixed and the other slides; uses biocular reading (distance between the 2 lateral orbital rims) to establish a baseline; uses the position of the corneal apex to determine the position of the globe within the orbit
NSN 5945-01-054-2130
NSN 5910-00-419-5424
NSN 5910-00-808-0089
NSN 6145-00-107-7913
NSN 7035-00-981-7216
NSN 5835-00-313-7197
NSN 6130-01-442-4091
NSN 6620-01-406-6840
NSN 5925-01-008-5205
NSN 5998-00-122-1510
NSN 5925-00-817-8579
NSN 5975-00-406-4753