作者:标准资料网 时间:2024-05-14 09:11:47   浏览:8910   来源:标准资料网

【英文标准名称】:Visualacuitytesttypes-Testchartsforclinicaldeterminationofdistancevisualacuity-Specification
【原文标准名称】:视力检测方式.视力临床测定用检测表规范
【标准号】:BS4274-1-2003
【标准状态】:现行
【国别】:英国
【发布日期】:2003-01-13
【实施或试行日期】:2003-01-13
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:眼科试验设备;眼科设备;视力测验表;字母
【英文主题词】:Letters(symbols);Ophthalmicequipment;Ophthalmictestequipment;Testcharts(ophthalmic)
【摘要】:ThisPartofBS4274specifiesminimumrequirementsfortestchartsandtesttypesemployinguprightsans-serifcapitallettersforuseintheclinicaldeterminationofdistancevisualacuity.NOTEUnlessotherwiseindicatedbythecontext,theword"letter"includes,inanyorientation,thesingleletterC(Landoltorbrokenring)andthesingleletterE(illiterateE).ThisPartofBS4274isprimarilyintendedforclinicalmeasurementsbutmaybeusedforotherpurposessuchasscreening,certificationandlicensing.Itisnotapplicabletochartprojectors,chartsortypesdesignedforspecializeduse(e.g.crowdingsymbols,lowercaseletters,isolatedletters,lowvisionevaluationandcontrastsensitivitytesting).NOTEThisBritishStandardmakesnoreferencetosurroundingluminancebecausethisrelatestotheconditionsintheconsultingroomorclinicitselfandthisisoutsidetheScopeofthisBritishStandard.Nevertheless,thelevelofsurroundingluminancecanseriouslyaffectthevisualacuityscoresobtained,forexample,byproducingglareorexcessivecontrast.Attention,therefore,shouldbepaidtothelevelofsurroundingluminancewheninstallingandutilizingthesetestcharts.
【中国标准分类号】:C40
【国际标准分类号】:11_040_70
【页数】:14P.;A4
【正文语种】:英语