Evaluation and design machining methods of double-faced free-form surface lens

Abstract

The invention discloses an evaluation method of a double-faced free-form surface lens. A lens-eye pupil is used as an optical system to evaluate global luminosity distribution and astigmatism distribution. The astigmatism distribution of the lens is subtraction of vectors of astigmatisms of the front and back surfaces of the lens. The evaluation method considers the optical system, namely the lens-eye pupil, under a state of wearing the lens, so that the quality of the lens can be quantitatively evaluated, an evaluated result is relatively reasonable and the optimal visuality of the lens can be obtained. Furthermore, in the designing process of the lens, the lens can be directly evaluated so that a lens designing period is shortened into steps of designing, evaluating, optimizing the designing and machining; and therefore, the cost is reduced and the evaluation method is convenient for industrial popularization and application.

Description

technical field

[0001] The invention relates to an evaluation, design and processing method of a free-form lens, in particular to an evaluation method of a double-sided free-form lens. Background technique

[0002] Free-form lenses are mainly represented by progressive multifocal lenses. Progressive multifocal lenses can meet the needs of distance vision and near vision at the same time, and avoid defects such as bifocal lenses breaking when switching between distance vision and near vision. Therefore, the application of progressive multifocal ophthalmic lenses is becoming more and more widespread. See attached figure 1 , The surface of the progressive multifocal ophthalmic lens is divided into a distance zone 1, a near zone 2, an intermediate transition zone 3 and an astigmatism zone 4. Spectacle lenses consist of a front surface and a back surface. Double-sided progressive multifocal lenses refer to lenses whose front surface and rear surface are both progressive surfac...

Images