TECHNICAL ISO/TR REPORT 19498 First edition 2015-12-15 Ophthalmic optics and instruments Correlation of optotypes Optique et instruments ophtalmiques - Correlation des optotypes Reference number ISO/TR 19498:2015(E) SO International Organization for Standardization ZHEJIANG INST OF STANDARDIZATION C1 5956617 IS02015 vided by IHS underI itted without license from IHS IS0/TR 19498:2015(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2015, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. IS copyright office Ch: de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel.+4122 749 0111 Fax+412274909 47 [email protected] www.iso.org Internatinair PrganizationforStandardization ensee-ZHEJIANG INSTOF STANDARDIZAoISQ15- All rights reserved Not for Resale, 2016/3/29 05:15:49 etworking permitted without license from IHS IS0/TR 19498:2015(E) Contents Page Foreword ..iv 1 Scope .1 2 General requirements for optotypes ..1 3 Correlation of optotypes. 3.1 Selection of optotypes for correlation testing. .1 3.2 Test area. .1 3.3 Presentation of the optotypes 1 3.4 Corrective lenses .2 3.5 Test distance 2 3.6 Luminance 4 Assignment of an acuity score .2 5 Assessing the equivalence of two kinds of optotype 6 Significance of the difference between the two means Bibliography 4 iii ee=ZHEJIANG INSTOFSTANDARDIZATION C15956617 vided by IHS under I thout license from IHS Not for Resale, 2016/3/29 05:15:49