Standard No.:	GB 11533-2011
English Name:	Standard for logarithmic visual acuity charts
Chinese Name:	标准对数视力表
Chinese Classification:	C56    School sanitation
Professional Classification:	GB    National Standard
Issued by:	AQSIQ, SAC
Issued on:	2011-12-30
Implemented on:	2012-5-1
Status:	valid
Superseding:	GB 11533-1989 STANDARD logarithmic visual acuity charts
Language:	English
File Format:	PDF
Word Count:	4000 words
Price(USD):	100.0
Delivery:	via email in 1 business day

1 Scope This Standard specifies design standards, printing dimensions, application method and visual acuity statistic method for visual acuity chart. This Standard is applicable to distant and near optometry used for common physical examination, recruitment and employment of children at 3 or above, adolescent and adults; it may apply visual acuity disorder screening, ophthalmology and visual optics clinic by reference. 2 Terms and Definitions For the purposes of this Standard, the following terms and definitions apply. 2.1 Optotype Letter, digit and figure for visual acuity measurement 2.2 Visual angle The angle of two points of an external object projecting on eye nodal point (N), expressed by (a) in (') (see Figure 1)

Contents 1 Scope 2 Terms and Definitions 3 Design Standards for Visual Acuity Chart 4 Printing Dimensions of Visual Acuity Charts 5 Application Method of Visual Acuity Chart 6 Visual Acuity Statistics 7 Others Appendix A (Informative) Standard Logarithm Distant Visual Acuity Chart Appendix B (Informative) Standard Logarithm Near Visual Acuity Chart