ISO/FDIS 10322

ISO/DISFDIS 10322:2025(en)
ISO/TC 172/SC 7/WG 3
Date: 2025-10-21
Secretariat: DIN
Date: 2026-xx
Ophthalmic optics — Semi-finished blanks
Optique ophtalmique – — Verres blancsde lunettes semi-finis
FDIS stage
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ii
Contents
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification. 1
5 Requirements . 2
5.1 General. 2
5.2 Optical requirements for the finished surface . 2
5.3 Geometrical tolerances . 4
5.4 Orientation of the plane of transmission for polarizing blanks . 6
5.5 Packaging . 7
6 Test methods . 7
6.1 General. 7
6.2 Determination of surface power . 7
6.3 Verification method for addition power or variation power . 8
6.4 Segment dimensions and position measurement method for multifocal blanks . 10
6.5 Inspection method for material and surface quality . 10
7 Marking and identification . 11
7.1 Marking . 11
7.2 Labelling on the package . 11
7.3 Information to be made available . 12
8 Reference to this document . 13
Annex A (informative) Material and surface quality. 14
Annex B (informative) Conversion of surface power and surface power tolerances from the
refractive index of the blank to that of an instrument's fixed reference . 16
Bibliography . 19

iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 172, Optics and photonics, Subcommittee SC 7,
Ophthalmic optics., in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 170, Ophthalmic optics, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This fifthfirst edition of ISO 10322 cancels and replaces the fourth editions (edition of ISO 10322-1:2016 and
ISO 10322-2:2016),, which have been combined and technically revised.
The main changes are as follows:
— — the two original parts have been combined;
— — blanks have been classified by the type of finished surface, not by their intended use, since what were
termed single-vision blanks are now also used to make multifocal or power-variation surfaces by using
free form technology;
[ ]
— — the terminology related to power-variation lenses that was introduced with ISO 21987 :2017 [1] has
been adopted to avoid the separate descriptions necessary for progressive-power and degressive power
blanks;
— in 5.1— , a cross reference has been made in 5.1 to the requirements on the material of the blank that
are in ISO 14889;
— — the tables giving the spherical power and cylindrical power tolerances are now both in the same
subclause, and the tolerances for cylindrical powers between 0,00 D and ≤0,25 D have been transferred
to the cylindrical power tolerance table;
iv
— — blank size: effective size is now called actual size and the tolerances for actual and usable sizes
changed;
— — the default position for the distance power measurement when measuring the addition power for
multifocal blanks has been moved to the geometrical centre of the blank;
— — the text on addition power and variation power measurement has been made more similar to that
in ISO 8980-1 and ISO 8980-2, where appropriate (these two standards are also being revised and
combined.)).
Any feedback or questions on this document should be directed to the user’s national standards body.
A complete listing of these bodies can be found at www.iso.org/members.html.
v
Ophthalmic optics — Semi-finished blanks
1 Scope
This document specifies requirements for the optical and geometrical properties of semi-finished blanks.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. 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 photonics — Reference wavelengths
ISO 8598--1, Optics and optical instruments — Focimeters — Part 1: General purpose instruments
ISO 13666, Ophthalmic optics — Spectacle lenses — Vocabulary
ISO 14889:2025, Ophthalmic optics — Spectacle lenses — Fundamental requirements for uncut finished lenses
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 13666, together with the following,
apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obp
— — IEC Electropedia: available at https://www.electropedia.org/
3.1 3.1
single- surface-power blank
blank with the finished surface having a single nominal surface power
Note 1 to entry: This includes blanks with spherical, aspherical, cylindrical and atoroidal surfaces.
[SOURCE: ISO 13666:2019, 3.8.2 – modified, ”spherical”, “cylindrical” and “and atoroidal” have been added to
Note 1 to entry.]
4 Classification
Semi-finished blanks (shortened to blanks in the remainder of this document for easier reading) shall be
classified according to the finished surface as follows:
a) a) single- surface-power blanks;
b) b) multifocal blanks;
c) c) power-variation blanks.
5 Requirements
5.1 General
The tolerances shall apply at a temperature of (23 ± 5) °C. .
The material of the blank shall comply with ISO 14889:2025, 4.3.1 and 4.3.2.
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 blank at
one of the two reference wavelengths specified in ISO 7944.
The reference point or points shall be specified by the manufacturer. If no reference point is specified, the
blank's geometrical centre is assumed to be the reference point.
The power ranges and tolerances in Tables 1, 2, 3, and 4 are expressed as surface power values, in dioptres, in
the refractive index of the material of the blank being measured.
5.2.2 Surface power
5.2.2.1 Single surface-power blanks and multifocal blanks
The tolerances on the intended surface spherical power of single-surface-power blanks and multifocal blanks
as specified in Table 1 shall apply at the reference point and shall be measured using the method described
in 6.26.2;; see also Annex BAnnex B.
Table 1 — Tolerances on the surface spherical power of single-surface-power and multifocal blanks
All values are given in dioptres (D) in the refractive index of the material
a, b ab
Nominal surface power power
a, b
ab
Tolerance on surface power power
(absolute value)
≥0,00 and ≤2,00 ±0,09
>2,00 and ≤10,00 ±0,06
>10,00 and ≤15,00 ±0,09
>15,00 and ≤20,00 ±0,12
>20,00 ±0,25
a  For blanks that have an absolute surface cylindrical power in the range ≥0,00 and <0,25 D,
𝐹 +𝐹
1 2
these nominal surface powers and the tolerances apply to the mean sphere: , , where F and F
1 2
are the absolute values of the surface powers of the principal meridians.
b  For blanks that have an absolute surface cylindrical power ≥0,25 D, these nominal surface
powers and the tolerances apply to the principal meridian of lower absolute power.

The tolerances on the intended surface cylindrical power, including surfaces intended to have no cylindrical
power, as specified in Table 2 shall apply at the reference point and shall be measured using the method
described in 6.26.2;; see also Annex BAnnex B.
Table 2 — Tolerances on the surface cylindrical power of single-surface-power and multifocal
blanks
All values are given in dioptres (D) in the refractive index of the material
Cylindrical power Absolute mean spherical surface Tolerance on surface
(absolute value) power cylindrical power
≤15,00 ±0,06
≥0,00 and < 0,25
>>15,00 ±0,08
≥0,25 and ≤4,00 ±0,06
a
>4,00 and ≤6,00 ±0,09
>6,00 ±0,12
a The tolerance on the power of the principal meridian with lower absolute power is given in Table 1.

5.2.2.2 Power-variation blanks
5.2.31.1.1 Power-variation blanks
The tolerances on the surface power of blanks with power-variation surfaces as specified in Table 3 shall apply
at the primary reference point and shall be measured using the method described in 6.26.2;; see also
Annex BAnnex B.
Table 3 — Tolerances on the surface power at the primary reference point of power-variation
blanks
All values are given in dioptres (D) in the refractive index of the material
Tolerance on surface
Tolerance on the surface mean
a a
sphere
cylindrical power power
Nominal surface power
𝐹 + 𝐹
1 2
|𝐹 − 𝐹 |
1 2
≥0,00 and ≤10,00 ±0,09 0,09
>10,00 and ≤15,00 ±0,12 0,12
NOTE F1 and F2 are the absolute values of the surface powers of the principal meridians.
a  Relative to zero, or to any intended surface cylindrical power of the blank's design.
5.2.45.2.3 Uniformity of the surface power of spherical single-surface-power blanks and
multifocal blanks
Over a zone of 40 mm diameter centred around the reference point, the surface power of blanks with spherical
surfaces shall not deviate by more than 0,06 D from the surface power measured at the reference point.
For multifocal blanks, this excludes the area of the segment and around the dividing line where this interferes
with the measurement.
The uniformity shall be determined using a suitable instrument and the method described in 6.26.2.
5.2.55.2.4 Surface addition power for multifocal blanks and variation power for power-variation
blanks
The tolerances on the addition power or variation power as specified in Table 4 shall apply at the reference
points and shall be measured using the method described in 6.36.3;; see also Annex BAnnex B.
This subclause applies to power-variation blanks only if they have both a primary and a secondary reference
point.
Table 4 — Tolerances on the surface addition power or variation power
All values are given in dioptres (D) in the refractive index of the material
Surface addition power Tolerance
or variation power
≤4,00 ±0,12
>4,00 ±0,18
5.3 Geometrical tolerances
5.3.1 Classification of, and tolerances on, the size
The sizes are classified and tolerances applied as given in Table 5:.
Table 5 – — Classification of sizes and tolerances for blanks
Symbol Tolerance
Name Classification
a a
Symbol (mm)
Nominal size dn The label or packaging value No tolerance applied
+2,0
Actual size da The largest physical diameter of the blank
−1,0
The diameter of the blank that the manufacturer
+2,0
Usable size d
u
−1,0
states is usable
a These symbols are given to help in interpretation of this subclause, not for general use.

The tolerance on usable size does not apply to blanks for lenses with a carrier curve, such as lenticulars.
For blanks that are intentionally not round, or that have different horizontal and vertical dimensions, the
manufacturer shall state the equivalent sizes for the horizontal and vertical dimensions, separated by '×'.
NOTE: This typically applies to elliptical shaped blanks. It also applies to polarizing blanks with notches indicating
the intended horizontal orientation of the lens, where the notching maycan result in different usable horizontal and
vertical dimensions.
For the usable size of predecentred blanks, the horizontal dimensions shall be indicated by the physical usable
dimension of the blank followed by the effective larger dimension, the values separated by a '/'.
Predecentred blanks can have an aspherical or power-variation finished surface, with the design reference
point displaced from the geometrical centre, usually nasally, in order to provide an effectively larger blank.
EXAMPLE. When mounting lenses in frames, most lenses are decentred nasally from the boxed centre since
centration distances are typically smaller than the boxed centre distance. This means that the centration point is closer
to the nasal rim than the temporal. Hence an uncut lens, and therefore the blank, has to have a size corresponding to the
double of this larger, temporal distance. As Figure 1,, which illustrates a view from above the finished surface of a blank
for a right power-variation lens, shows, a horizontal displacement (c) of 2,5 mm of the design prism reference point, PRP
(2) from the geometric centre (1) of a blank of actual size (d ) 65mm65 mm provides a larger temporal zone. The
a
horizontal distance between the PRP and the blank’s temporal edge is 35mm35 mm, making it equivalent to about half a
blank of effective size (de) 70 mm. These dimensions are identified as 65/70. The resulting narrower nasal zone (the
horizontal distance between the PRP and the nasal edge is equal to 30mm30 mm) normally does not affect the edging
process as the edged shape (6) is typically shifted temporally, as illustrated.
Key
1 geometrical centre 6 edged shape
2 prism reference point (PRP) da actual size
3 permanent markings de effective size
4 actual physical size c displacement
5 effective virtual size
Key
1 geometrical centre
2 prism reference point (PRP)
3 permanent markings
4 actual physical size
5 effective virtual size
6 edged shape
da actual size
d effective size
e
c displacement
Figure 1 – — Illustration of predecentred power-variation blank

5.3.2 Thickness
5.3.2.1 Centre thickness
The centre thickness, when measured at the geometrical centre (unless otherwise stated by the
manufacturer), shall be neither less than the minimum thickness stated by the manufacturer nor exceed this
minimum thickness by more than 3 mm.
5.3.2.2 Edge thickness
When measured at the point stated by the manufacturer, the edge thickness shall be neither less than the
minimum thickness stated by the manufacturer nor exceed this minimum thickness by more than 3 mm.
5.3.3 Segment tolerances for blanks with multifocal surfaces
5.3.3.1 Dimensions
When using one of the methods described in 6.46.4,, each of the segment dimensions (width, depth and
intermediate depth) shall not deviate from its nominal value by more than ±0,5 mm.
If sold as a matched pair, each of the segment dimensions shall not differ between the left and right blanks by
more than 0,7 mm.
5.3.3.2 Position
The segment position shall be measured from the distance reference point using the measurement method
described in 6.46.4. If no reference point is specified, the blank's geometrical centre may be assumed to be
the distance reference point. The horizontal position (horizontal displacement of segment) shall be the
horizontal distance, in millimetres, from the distance reference point to the segment extreme point. The
vertical position (vertical segment displacement) shall be the vertical distance, in millimetres, from the
distance reference point to the segment's dividing line (or highest point of the segment for segments with
curved tops and round segments).
Neither the horizontal nor the vertical position shall deviate from the nominal value by more than ±1,0 mm.
Segment size and position tolerances are applicable only if the segment boundaries are clearly delineated.
5.4 Orientation of the plane of transmission for polarizing blanks
a) a) Polarizing blanks with spherical and aspherical surfaces shall include permanent or non-
permanent marking on the horizontal meridian to identify clearly the intended horizontal orientation. If
intended for sun glare attenuation, the plane of transmission shall be aligned to the permanent or non-
permanent alignment reference markings at 90° ± 3°.
Alternatively, if manufacturers or suppliers chose to include marking on the vertical meridian of the lens
blank to indicate the plane of transmission, this alternative method of marking shall be clearly identified.
If intended for sun glare attenuation, the plane of transmission shall be alig
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