AS ISO 10322.1:2017 pdf free.Ophthalmic optics – Semi-finished spectacle lens blanks, Part 1: Specifications for single-vision and multifocal lens blanks.
Compared with previous editions, this part of ISO 10322 now applies to all types of semi-finished singlevision and multifocal lens blanks.
This part of Iso 10322 specifies requirements for the optical and geometrical properties of all semifinished single-vision and multifocal spectacle lens blanks.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 7944, Optics and optical instruments — Reference wavelengths
ISO 8598-1, Optics and optical instrunents — Focimeters — Part 1: General purpose instruments
ISO 13666, Ophthalmic optics — Spectacle lenses — Vocabulary
4 Classification
Semi-finished lens blanks (shortened to lens blanks in the remainder of this part of ISO 10322 for easier reading) are classified according to the finished surface as follows:
a) single-vision lens blanks;
b) multifocal lens blanks;
c) progressive-power and degressive-power lens blanks.
5 Requirements
5.1 General
The tolerances shall apply at a temperature of 23 °C ± 5 °C.
5.2 Optical requirements for the finished surface
5.2.1 General
The optical tolerances shall apply to the manufacturer’s stated values at the reference points of the lens blank at one of the reference wavelengths specified in Iso 7944.
The reference point should be specified by the manufacturer. If no reference point is specified, the blank’s geometric centre may be assumed to be the reference point.
The optical tolerances in Tables 1., 2. and 3 are expressed as surface power values, in dioptres, in the refractive index of the material of the lens blank being measured.
5.2.3 Uniformity of the surface power of lens blanks with nominally spherical surfaces
Over a zone of 40 mm diameter centred around the reference point, the surface power shall not deviate by more than 0,06 D from the surface power measured at the reference point.
The uniformity shall be determined using a suitable instrument and the method described in 6.2.
5.2.4 Tolerances on the intended surface cylindrical power
The tolerances on the intended surface cylindrical power as specified in Table 2 shall apply at the reference point and shall be measured using the method described in 6.2.