Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: ANSI Z80.23:2018
• Năm ban hành / Publication date: 2018
• Tình trạng / Status: A - Còn hiệu lực
• Tên tiếng Anh / Title in English: Ophthalmics – Corneal Topography and Tomography Systems – Standard Terminology, Requirements
• Thay thế cho / Replace: ANSI Z80.23:2008
• Số trang / Page: 32

Phạm vi áp dụng / Scope of standard

Scope:

This American National Standard applies to instruments, systems and methods that are intended to measure the shape of the cornea of the human eye over a majority of its area. The measurements of the anterior and/or posterior surface in local areas may be of curvature and/or three dimensional topographical measurements of the surface. The measurements may be used to derive more global parameters used to characterize the surfaces. Instruments classified as ophthalmometers or keratometers are not covered by this standard.

Purpose:

This standard defines certain terms that are peculiar to the characterization of the corneal shape so that they may be standardized throughout the field of vision care and have common meaning for all those who have occasion to participate in this area.

This standard sets forth minimum requirements for instruments and systems that fall into the class of corneal topographers.

This standard sets forth tests and verification procedures that will verify that a system or instrument complies with the standard and so qualifies as a corneal topographer or corneal tomographer in the meaning of this standard.

This standard sets forth certain tests and verification procedures that will allow the verification of capabilities of systems that are beyond the minimum required for corneal topographers or corneal tomographers.