EP 2089751 A2 20090819 - MULTI-LAYERED MULTIFOCAL LENS WITH BLENDED REFRACTIVE INDEX
Title (en)
MULTI-LAYERED MULTIFOCAL LENS WITH BLENDED REFRACTIVE INDEX
Title (de)
MEHRSCHICHTIGE MULTIFOKALLINSE MIT GEMISCHTEM BRECHUNGSINDEX
Title (fr)
LENTILLES MULTICOUCHES A FOCALES MULTIPLES ET A INDICE DE REFRACTION PROGRESSIF
Publication
Application
Priority
- US 2007022574 W 20071025
- US 85446706 P 20061025
Abstract (en)
[origin: WO2008051578A2] The lens of the present invention relates to multifocal spectacle lenses, including bifocal and trifocal lenses, with improved cosmetic appearance, optical performance and wide visual field. The lens comprises a plurality of axially layered and bonded lens sections of continuous curvature at least one of which has a changing refractive index incorporating a refractive index blend area oriented transverse to a meridian of the lens. The blend eliminates visibility of the joining area of adjacent portions of generally constant refractive index and the abrupt magnification shift and image jump typical of segmented multifocal lenses. The areas of generally constant refractive index provide the refractive powers for corresponding discrete vision portions of the lens. The other layer(s) of the lens incorporates a constant or similarly changing refractive index.
IPC 8 full level
G02B 23/24 (2006.01)
CPC (source: EP)
B29D 11/00355 (2013.01); G02C 7/06 (2013.01); G02C 2202/12 (2013.01); G02C 2202/16 (2013.01)
Citation (search report)
See references of WO 2008051578A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2008051578 A2 20080502; WO 2008051578 A3 20080626; CN 101646968 A 20100210; EP 2089751 A2 20090819; JP 2010507833 A 20100311; MX 2009004327 A 20091113
DOCDB simple family (application)
US 2007022574 W 20071025; CN 200780048141 A 20071025; EP 07861499 A 20071025; JP 2009534640 A 20071025; MX 2009004327 A 20071025