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Subclass RE
| RE1-994 | Ophthalmology | |
| RE75-79 | Examination. Diagnosis | |
| RE80-87 | Eye surgery | |
| RE88 | Ophthalmic nursing | |
| RE89 | Eye banks | |
| RE91-912 | Particular diseases of the eye | |
| RE918-921 | Color vision tests, charts, etc. | |
| RE925-939 | Refraction and errors of refraction and accommodation | |
| RE939.2-981 | Optometry. Opticians. Eyeglasses | |
| RE986-988 | Artificial eyes and other prostheses | |
| RE991-992 | Ocular therapeutics | |
