ISO/TC 172/SC 7/WG 3 - Spectacle lenses

This document specifies requirements for reference lenses for the calibration and verification of focimeters that are used for the measurement of spectacle form lenses, e.g. those complying with ISO 8598-1. It also gives a method for the determination of the back vertex power of the reference lenses. NOTE It is accepted that other reference lenses can also be used with powers within the given range, manufactured to the same standard of accuracy and form, but different back vertex powers. However, only lenses with integer nominal powers, as described in 4.1, can be used for the calibration of digitally-rounding focimeters.

This document specifies requirements for the transmittance properties of uncut and unmounted finished spectacle lenses, including attenuation of solar radiation. This document is not applicable to — spectacle lenses having specific transmittance or absorption characteristics prescribed for medical reasons, — products to which specific personal protective equipment transmittance standards apply, and — products intended for direct observation of the sun, such as for solar-eclipse viewing. NOTE 1 By reference to ISO 21987 and ISO 14889, this document also applies to lenses mounted in spectacles. NOTE 2 Optical and geometric requirements are given for uncut finished spectacle lenses in ISO 8980‑1 and ISO 8980‑2, and for mounted lenses, in ISO 21987.

This document describes the most commonly used test methods considered in standardization work relating to scratch and abrasion resistance of plastic spectacle lenses along with their technical capacities and limitations. It includes the ISO test method for assessment of claims for basic abrasion resistance in ISO 8980-5. This document is intended to be of benefit to any future interest in ISO standardization on scratch and abrasion resistance of spectacle lenses.

This document defines terms relating to ophthalmic optics, specifically to blanks, finished spectacle lenses and fitting purposes. Terms relating to processes and material for fabrication and surface treatment (other than some specific terms relating to coatings), and terms relating to defects in materials and after optical processing are given in ISO 9802.

This document describes visible solar radiation with wavelengths close to the UV range, its transmission to, within and the effects on the human eye. The wavelengths concerned are from 380 nm to 500 nm, covering the colours of violet, indigo and blue — often referred to as the "blue wavelengths". It also explains the filtering effects and measurement of spectacle lenses and sunglasses, thereby providing background information to understand the transmittance requirements related to filtering effects of lenses and filters in the available spectacle lens and sunglass standards. This document does not address the issues of protection from artificial sources of radiation. This document is intended to be of benefit to any future interest in ISO standardization related to transmission of solar radiation with wavelengths near to and greater than 380 nm. The Bibliography provides a source of relevant useful references.

ISO 8980-1:2017 specifies requirements and verification methods for the optical and geometrical properties for uncut finished single-vision and multifocal spectacle lenses.

ISO 21987:2017 specifies requirements and test methods for mounted spectacle lenses relative to the prescription order.

ISO 8980-2:2017 specifies requirements and verification methods for the optical and geometrical properties for uncut finished power-variation lenses.

ISO 10322-1:2016 specifies requirements for the optical and geometrical properties of all semi-finished single-vision and multifocal spectacle lens blanks.

ISO 10322-2:2016 specifies requirements for the optical and geometrical properties of semi-finished lens blanks with finished progressive-power and degressive-power surfaces.

ISO 14889:2013 specifies fundamental requirements for uncut finished spectacle lenses. It is not applicable to protective spectacle lenses. ISO 14889:2013 takes precedence over the corresponding requirements of other standards, if differences exist.

The purpose of ISO/TR 28980:2007 is to explain the changes relating to power measurements in the revised editions of ISO 8980-1 and ISO 8980-2. In order to illustrate the issues raised, an inter-laboratory power measurement study was conducted on ten different lenses measured by nine organizations worldwide. Twenty-five focimeters of different types were used. The test lenses were spherically powered allyl diglycol carbonate (ADC) hard resin lenses surfaced to -4,00 D, -2,00 D, 0,00 D, +2,00 D, and +4,00 D, each with an addition power of 2,50 D. Five were D28 bifocals and five were progressive power lenses. The measurements were front distance power, front near power, back distance power and back near power, for each lens and for each focimeter used. Each lens was measured nine times: five measurements taken without repositioning the lens and four measurements taken with the lens repositioned each time. The assessed parameters were divided in three categories: discrepancies due to focimeter design and measurement methods; systematic errors; random errors. For each parameter, experimental results are given, as well as theoretical ones when needed. Measurement data include front distance portion power, front near portion power, back distance portion power and back near portion power. Unless stated otherwise, in order to show relevant information, the results shown are for the D28 bifocals when no different behaviour was found for the progressive power lenses.

ISO 8980-4:2006 specifies optical and non optical requirements, including durability, and test methods for anti-reflective coatings on spectacle lenses. ISO 8980-4:2006 does not deal with the following topics: transmittance and absorbtance; the colour of the reflected light.

ISO 8980-5:2005 specifies the requirement and test method for spectacle lens surfaces that are claimed to provide a basic level of abrasion resistance including those with coatings. A lens claimed to be abrasion-resistant shall meet the requirements on both front and back surfaces. Lens powers and surface form is restricted for testing, however test results are applicable to claims for lenses and lens surfaces with identical properties other than the lens power or surface radius. ISO 8980-5:2005 does not attempt to define the properties of lens surfaces with abrasion resistance better than the following defined criteria.

This International Standard specifies the minimum requirements for complete single-vision ready-to-wear near-vision spectacles. These spectacles are not intended for regular use without the approval of an eyecare professional.

ISO 8980-1:2013 specifies requirements for the transmittance properties of uncut finished spectacle lenses and mounted pairs, including attenuation of solar radiation.

ISO 13666:2011 defines basic terms relating to ophthalmic optics, specifically to semi-finished spectacle lens blanks, finished spectacle lenses and fitting purposes. Terms relating to processes and materials for fabrication and surface treatment (other than some specific terms relating to coatings), and terms relating to defects in materials and after optical processing, are given in ISO 9802.

ISO 21987:2009 specifies requirements for mounted spectacle lenses relative to the prescription order.

ISO 10322-2:2006 specifies requirements for the optical and geometrical properties of semi-finished progressive power spectacle lens blanks.

ISO 10322-1:2006 specifies requirements for the optical and geometrical properties of semi-finished single-vision and multifocal spectacle lens blanks.

ISO 8980-1:2004 specifies requirements for the optical and geometrical properties for uncut finished single-vision and multifocal spectacle lenses.

ISO 8980-2:2004 specifies requirements for the optical and geometrical properties for uncut finished progressive spectacle lenses.

ISO 8980-3:2003 specifies requirements for the transmittance properties of uncut finished spectacle lenses.

ISO 14889:2002 specifies fundamental requirements for uncut finished spectacle lenses. This International Standard is not applicable to protective spectacle lenses. ISO 14889:2002 takes precedence over the corresponding requirements of other standards, if differences exist.

Specifies requirements for the optical and geometrical properties of semi-finished progressive power lens blanks.

Gives requirements for the optical and geometrical properties for uncut finished single-vision and multifocal spectacle lenses.

Specifies requirements for the optical and geometrical properties of semi-finished single-vision and multifocal lens blanks.

Gives requirements for the optical and geometrical properties for uncut finished progressive power spectacle lenses.

Lays down a method of correlation between a given set of optotypes and the standard optotype (Landolt ring) specified by ISO 8596.

Specifies a range of Landolt ring optotypes and describes a method for measuring distance visual acuity under daylight conditions for the purposes of certification or licensing.