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
Organic hard resin: thermoplastic hard resin
Plastic material, consisting principally of organic polymers, that can be repeatedly softened by heating and hardened by cooling, and in the softened state can be repeatedly shaped by flow into lenses or lens blanks by moulding, extrusion or forming.