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Optical System Determination According to Advanced Criteria

  • US 20110202286A1
  • Filed: 10/16/2009
  • Published: 08/18/2011
  • Est. Priority Date: 10/16/2008
  • Status: Active Grant
First Claim
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1. A method implemented by computer means for calculating by optimization an optical system for example an ophthalmic lens according to at least one criterion comprising the steps of:

  • i. Selecting at least one criterion among one or several of the three following criteria groups consisting of;

    central vision criteria group consisting of;

    ocular deviation, object visual angular field in central vision, image visual angular field in central vision, or a variation of preceding criteria;

    peripheral vision criteria group consisting of;

    pupil field ray deviation, object visual angular field in peripheral vision, image visual angular field in peripheral vision, prismatic deviation in peripheral vision, magnification in peripheral vision, or a variation of preceding criteria;

    general criteria group consisting of lens volume, magnification of the eyes, temple shift;

    ii. For each selected criterion of step i.), defining;

    an evaluation zone comprising one or several evaluation domains and a set of target values associated to said evaluation domains, if said criterion of step i.) belongs to the central or to the peripheral vision criteria groups, ora target value associated to said criterion of step i.), if said criterion belongs to the general criteria group;

    iii. Selecting a starting optical system and defining a working optical system to be equal to the starting optical system, where the starting optical system and the working optical system comprise each at least two optical surfaces;

    iv. Evaluating for the working optical system and for each selected criterion of step i.);

    a set of criterion values associated to said evaluation domains of step ii.), if said criterion of step i.) belongs to the central or peripheral vision criteria groups,a criterion value, if said criterion of step i.) belongs to the general criteria group;

    v. Modifying at least one parameter of the working optical system, in order to minimize a cost function considering target values and criterion values by repeating step iv.) till a stop criterion is satisfied.

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