BS 4274-1:1968

Visual acuity test types-Specification for test charts for clinically determining distance visual acuity

BSI Group , 01/26/1968

Publisher: BS

File Format: PDF

$80.00$160.02

Description

Standard By:BSI Group , 01/26/1968

Published:01/26/1968

Pages:12

ISBN(s):0580000397

File Size:1 file

Language:English

Note:This product is unavailable in Ukraine, Russia, Belarus

Basic requirements for test charts designed for either internal or external illumination, employing English (Roman) capital letters to determine the distance visual acuity. Provision is also made for the single letter C (Landolt or broken ring) and the single letter E (illiterate E) in various orientations.