Variant of CIP 2000 - NGS University-level Historical Groupings
- 51.18 - Ophthalmic and Optometric Support Services and Allied Professions
- 51.1801 - Opticianry/Ophthalmic Dispensing Optician
- 51.1802 - Optometric Technician/Assistant
- 51.1803 - Ophthalmic Technician/Technologist
- 51.1804 - Orthoptics/Orthoptist
- 51.1899 - Ophthalmic and Optometric Support Services and Allied Professions, Other
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