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 5950-01-146-4329
NSN 5985-01-351-5671
NSN 5960-01-123-9553
NSN 5925-00-882-4654
NSN 6150-00-538-9887
NSN 6685-00-248-3103
NSN 6645-01-415-3894
NSN 5960-00-782-7658
NSN 5935-01-273-7945
NSN 5975-00-525-2331
NSN 5990-01-212-2037
NSN 5910-01-464-3879