🔥🔥 Don’t Miss Out on Our End of Autumn Sale. If you have any questions, feel free to click the bottom right corner to contact our customer service..

Concat us[email protected]
Shopping Cart

No products in the cart.

🔍
BS EN ISO 19980:2021

BS EN ISO 19980:2021

$142.49

Ophthalmic instruments. Corneal topographers

Published By Publication Date Number of Pages
BSI 2021 30
PDF Format Searchable Printable Preview Now
Guaranteed Safe Checkout
Categories: ,

If you have any questions, feel free to reach out to our online customer service team by clicking on the bottom right corner. We’re here to assist you 24/7.
Email:[email protected]

This document 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 document and thus qualifies as a CT according to this document. It also specifies tests and procedures that allow the verification of capabilities of systems that are beyond the minimum requirements for CTs.

This document 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 document 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.

This document is not applicable to ophthalmic instruments classified as ophthalmometers.

PDF Catalog

PDF Pages PDF Title
2 National foreword
4 European foreword
6 Foreword
7 1 Scope
2 Normative references
3 Terms and definitions
10 3.8 Curvature
3.8.1 Axial curvature
14 3.16 Surface
4 Requirements
4.1 Area measured
15 4.2 Measurement sample density
4.3 Measurement and report of performance
4.4 Colour presentation of results
5 Test methods and test devices
5.1 Tests
5.1.1 Accuracy test
5.1.2 Repeatability test
5.2 Test surfaces
5.2.1 Reflection-based and Placido ring corneal topographers
5.2.2 Luminous surface corneal topographer
5.2.3 Optical-sectioning corneal topographer
16 5.2.4 Specification of test surfaces
5.2.5 Verification of test surfaces
5.2.6 Type testing of surfaces
17 5.3 Data collection — Test surfaces
5.4 Analysis of the data
5.4.1 General
18 5.4.2 Structure of the accuracy data set
5.4.3 Analysis of the paired data sets
19 5.4.4 Report of accuracy performance
6 Accompanying documents
7 Marking
20 Annex A (informative) Test surfaces for corneal topographers (CTs)
22 Annex B (informative) Standardized displays for corneal topographers (CTs)
25 Annex C (normative) Calculation of area-weighting values
27 Annex D (normative) Test methods for measuring human corneas
28 Bibliography

Related products

BS EN ISO 19980:2021
$142.49