ISO 19980:2012
Ophthalmic instruments - Corneal topographers
- Standard No.
- ISO 19980:2012
- Release Date
- 2012
- Published By
- International Organization for Standardization (ISO)
- Status
- Replace By
- ISO 19980:2021
- Latest
- ISO 19980:2021
- Scope
- This International Standard specifies minimum requirements for instruments and systems that fall into the class of corneal topographers (CTs). It also specifies tests and procedures to verify that a system or instrument complies with this International Standard and thus qualifies as a CT according to this International Standard. It also specifies tests and procedures that allow the verification of capabilities of systems that are beyond the minimum requirements for CTs. This International Standard defines terms that are specific to the characterization of the corneal shape so that they may be standardized throughout the field of vision care. This International Standard is applicable to instruments, systems and methods that are intended to measure the surface shape of the cornea of the human eye. NOTE The measurements can be of the curvature of the surface in local areas, three-dimensional topographical measurements of the surface or other more global parameters used to characterize the surface. It is not applicable to ophthalmic instruments classified as ophthalmometers. The following referenced documents are indispensable for the application 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. IEC 60601-1:2005, Medical electrical equipment — Part 1: General requirements for basic safety and essential performance 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 corneal apex location on the corneal surface where the mean of the local principal curvature is greatest 3.2 corneal eccentricity ec eccentricity, e, of the conic section that best fits the corneal meridian of interest NOTE If the meridian is not specified, the corneal eccentricity is that of the flattest corneal meridian (see Table 1 and Annex A). 3.3 corneal meridian θ curve created by the intersection of the corneal surface and a plane that contains the corneal topographer axis NOTE 1 A meridian is identified by the angle θ, that the plane creating it makes to the horizontal (see ISO 8429). NOTE 2 The value of θ, for a full meridian, ranges from 0° to 180° . 1
ISO 19980:2012 Referenced Document
- IEC 61966-2-1 Multimedia systems and equipment - Colour measurement and management - Part 2-1: Colour management - Default RGB colour space - sRGB; Corrigendum 1*， 2014-01-01 Update
- ISO 15004-1 Ophthalmic instruments — Fundamental requirements and test methods — Part 1: General requirements applicable to all ophthalmic instruments*， 2020-06-04 Update
- ISO 8429 Optics and optical instruments; Ophthalmology; Graduated dial scale
ISO 19980:2012 history
- 2021 ISO 19980:2021 Ophthalmic instruments - Corneal topographers
- 2012 ISO 19980:2012 Ophthalmic instruments - Corneal topographers
- 2005 ISO 19980:2005 Ophthalmic instruments - Corneal topographers
