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 5960-01-413-3877
NSN 6220-00-814-1598
NSN 6320-01-532-7491
NSN 5945-01-139-4260
NSN 6620-01-394-4042
NSN 5996-00-220-9414
NSN 6110-01-503-0186
NSN 6685-00-603-6640
NSN 5999-01-634-0576
NSN 6610-00-235-3002
NSN 6620-01-411-2295
NSN 7035-00-360-2008