O
- object speed limit
- object table
- ophthalmic lens
- Ophthalmometer
- Ophthalmoscope
- Ophthalmoscope graticules
- optical axis
- optical centre
- optical centre distance OCD
- optical dimensions
- optical material
- optical radiation
- Optical radiation hazard
- optical zone of magnifier
- Optimization
- Organic hard resin: thermoplastic hard resin
- Organic hard resin: thermosetting hard resin
Ophthalmoscope graticules
Patterns or targets or graticules which can be optionally positioned in the illuminating light path within the instrument and which will be imaged on the retina for diagnostic, measurement or therapeutic purposes.