SIST EN ISO 7921:2024 PDF
Ophthalmic optics and instruments - Near reading charts (ISO 7921:2024)
Ophthalmic optics and instruments - Near reading charts (ISO 7921:2024)
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 16
- Дата публикации:
- 15 апреля 2024 г.
- Издание:
- ISO 7921:2024 (EQV)
- ICS:
- 11.040.70
This document applies to printed, projected, and electronic displays of high-contrast text that are designed for assessment and measurement of near reading acuity under photopic conditions. The definitions and requirements of this document apply to the Latin alphabet.
Abstract
Overview
EN () specifies requirements for used to assess and measure . It covers printed, projected and electronic high‑contrast text displays intended for clinical and research use under . The standard defines measurement conventions based on the Latin alphabet and provides a standardized basis for expressing near reading acuity (including ) at a reference viewing distance of .
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