ISO/TR 28980-2007 眼科光学.柔性焦距透镜组.影响屈光度测量参数

标准号：ISO/TR 28980-2007
中文标准名称：眼科光学.柔性焦距透镜组.影响屈光度测量参数
英文标准名称：Ophthalmic optics - Spectacle lenses - Parameters affecting lens power measurement
标准类型：C40
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：C40
适用范围：The purpose of this Technical Report is to explain the changes relating to power measurements in the revisededitions of ISO 8980-1 [6] and ISO 8980-2 [7].In order to illustrate the issues raised, an inter-laboratory power measurement study was conducted on tendifferent lenses measured by nine organizations worldwide. Twenty-five focimeters of different types wereused. The test lenses were spherically powered allyl diglycol carbonate (ADC)1) hard resin lenses surfaced to–4,00 D, –2,00 D, 0,00 D, +2,00 D, and +4,00 D, each with an addition power of 2,50 D. Five were D28bifocals and five were progressive power lenses. The measurements were front distance power, front nearpower, back distance power and back near power, for each lens and for each focimeter used. Each lens wasmeasured nine times: five measurements taken without repositioning the lens and four measurements takenwith the lens repositioned each time.The assessed parameters were divided into three categories:discrepancies due to focimeter design and measurement methods;systematic errors;random errors.For each parameter, experimental results are given, as well as theoretical ones when needed. Measurementdata include front distance portion power, front near portion power, back distance portion power and backnear portion power.NOTE The results of all measurements are available on the ISOTC Server at the address given in the Bibliography[8].Unless stated otherwise, in order to show relevant information, the results shown are for the D28 bifocalswhen no different behaviour was found for the progressive power lenses.