ISO 18369-4:2017 specifies the methods of testing the physicochemical properties of contact lens materials. These are extraction, rigid lens flexure and breakage, oxygen permeability, refractive index and water content.
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Sisällysluettelo
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Physicochemical properties of contact lenses
4.1 Repeatability, test methods and units of measure
4.2 Extractables
4.3 Rigid lens flexural deformation and rupture
4.4 Oxygen permeability
4.5 Refractive index
4.6 Water content
5 Test report
Annex A Determination of oxygen permeability using the coulometric method (informative)
Annex B Determination of water content by refractive index (informative)
Annex C Calculation of oxygen permeability of hydrogel contact lenses based on water content (informative)
Annex D Measurement of refractive index using a prism coupling device (informative)
ISO 18369-1:2017 Ophthalmic optics -- Contact lenses -- Part 1: Vocabulary, classification system and recommendations for labelling specifications
ISO 18369-3:2017 Ophthalmic optics -- Contact lenses -- Part 3: Measurement methods
ISO 3696:1987 Water for analytical laboratory use -- Specification and test methods
ISO 18369-1:2017 Ophthalmic optics -- Contact lenses -- Part 1: Vocabulary, classification system and recommendations for labelling specifications
ISO 18369-3:2017 Ophthalmic optics -- Contact lenses -- Part 3: Measurement methods
ISO 3696:1987 Water for analytical laboratory use -- Specification and test methods