{"product_id":"frame-rule-city-rule","title":"Frame Rule (City Rule)","description":"\u003cdiv class=\"ewa-rteLine\"\u003e\n\u003cp class=\"MsoNormal\" style=\"margin: 0cm 0cm 0pt;\"\u003e\u003cspan lang=\"CY\" style=\"font-family: Tahoma; font-size: 9pt; mso-ansi-language: CY;\"\u003eThe City Frame \u0026amp; Lens Rule (sometimes known as the Serelo Rule) was designed at the City University, London. This rule can measure the following aspects of frame and lens parameters:\n\u003c\/span\u003e\n\n\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"margin: 0cm 0cm 0pt;\"\u003e\u003cspan lang=\"CY\" style=\"font-family: Symbol; font-size: 9pt; mso-ansi-language: CY; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol;\"\u003e\u003cspan\u003e\u003cspan style=\"font: 7pt 'Times New Roman';\"\u003e\n \n \n \n \n\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\n\n\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"margin: 0cm 0cm 0pt;\"\u003e\u003cspan lang=\"CY\" style=\"font-family: Tahoma; font-size: 9pt; mso-ansi-language: CY;\"\u003eAngle of crest. \nAngle of let-back. \nAngle of sides. \nDownward angle of drop. \nFrontal angle of pad. \nInward angle of drop. \nSplay angle of pad. \nVertical angle of pad.\n\u003c\/span\u003e\n\n\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"margin: 0cm 0cm 0pt;\"\u003e\u003cspan lang=\"CY\" style=\"font-family: Tahoma; font-size: 9pt; mso-ansi-language: CY;\"\u003eApical radius. \nBoxed lens size and centres. \nBridge width, crest and height. \nDistance between centres. \nDistance between lenses.\u003c\/span\u003e\n\n\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"margin: 0cm 0cm 0pt;\"\u003e\u003cspan lang=\"CY\" style=\"font-family: Tahoma; font-size: 9pt; mso-ansi-language: CY;\"\u003eDistance between pad centres and lenses. \nDistance between pad centres and tops. \nDistance between rims. \nFrame head width. \nFrame temple width. \nFront to bend.\u003c\/span\u003e\n\n\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"margin: 0cm 0cm 0pt;\"\u003e\u003cspan style=\"font-family: Tahoma; font-size: 9pt;\"\u003eFrontal width. \nHeight of pad centres and tops. \nInset of pad centre. \nJoint height. \nJoint size. \nLength of drop. \nLength to bend. \nLength to tangent.\u003c\/span\u003e\n\n\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"margin: 0cm 0cm 0pt;\"\u003e\u003cspan style=\"font-family: Tahoma; font-size: 9pt;\"\u003eProjection of bridge. \nLens insets, progression heights and segment positions. \nSegment diameters height and size. \n \n\u003c\/span\u003e\n\n\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"margin: 0cm 0cm 0pt;\"\u003e\n\n\n\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"margin: 0cm 0cm 0pt;\"\u003e\u003cspan style=\"font-family: Tahoma; font-size: 9pt;\"\u003eSupplied with an illustrated manual.\n\u003c\/span\u003e\n\n\u003c\/p\u003e\n\u003cp class=\"MsoNormal\" style=\"margin: 0cm 0cm 0pt;\"\u003e\n\n\u003c\/p\u003e\n\u003c\/div\u003e","brand":"SV","offers":[{"title":"Default Title","offer_id":53796761403735,"sku":"SV-SDW-504-C","price":55.88,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1015\/4360\/8663\/files\/SDW-504-C.jpg?v=1781603790","url":"https:\/\/www.sussex-vision.co.uk\/products\/frame-rule-city-rule","provider":"ESP\/SV","version":"1.0","type":"link"}