ISO 7921:2024 PDF
Ophthalmic optics and instruments — Near reading charts
Ophthalmic optics and instruments — Near reading charts
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 8
- Дата публикации:
- 9 февраля 2024 г.
- Издание:
- ISO IS 7921 edition 1 version 1
- 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
ISO 7921:2024 - "Ophthalmic optics and instruments - Near reading charts" specifies requirements, definitions and test methods for printed, projected and electronic near reading charts intended to assess under photopic (well-lit) conditions. The standard applies to the (and can inform work on similar alphabets) and defines a clinical notation system based on (logarithm of reading acuity determination), x‑height and other common notations (M size, N size, decimal acuity, reduced Snellen).
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