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| Title | Maker | Date Made | |
| Bruce Refracting Unit | Automatic Sight Testing Co Ltd | c.1889 | View |
| Optician's chair & British Refracting Unit | Calthorpe (maker); Ellis Optical Co (maker) | c.1933 | View |
| Phorometer | American Optical Company | 1930s | View |
| Raphael's Patent Opsiometer | J. Raphael & Co | c.1891 | View |
| refracting unit / phorometer | Mid 20th c. | View | |
| refracting unit / phorometer | American Optical Company | 20th c. | View |
| refracting unit / phorometer | American Optical Company | 20th c. | View |
| Stearman Refracting Unit | Stearman Optical Co Ltd | c.1959 | View |
| Supplementary Lenses for the Stearman Refracting Unit | Mid 20th c. | View |