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Subjects
- Refraction, Ocular[remove]20
- Eye Diseases3
- Eyeglasses3
- Refractive Errors3
- Lens, Crystalline2
- Retinoscopy2
- Vision, Ocular2
- Astigmatism -- therapy1
- Burnett, Swan M. (Swan Moses), 1847-1906.1
- Child1
- Models, Structural1
- Models, Theoretical1
- Nose Diseases1
- Ophthalmologic Surgical Procedures1
- Ophthalmoscopes1
- Optometry1
- Pharyngeal Diseases1
- Retinoscopes1
- Visual Fields1