netherlands code dating - Dual optic accommodating lenses
Conjugation power change was calculated as change in refraction at the spectacle plane with vertex distance to the posterior spectacle surface of 12 mm.
Anterior displacement of 1 mm was calculated to produce a change in conjugation power of approximately 1.2 D.
However, 1 mm movement of a 32 D IOL at that location would produce a change in conjugation power of approximately 2.6 D.
Having confirmed that in a model of the human eye, object distance change per unit axial movement increased with lens power, we investigated alternative scenarios whereby a dual optic lens system was created in which an anterior converging lens was assigned a high plus power well beyond that required to produce emmetropia, but a posterior diverging lens was assigned the minus power required to return the eye to emmetropia.
Elements are incorporated to control minimum separation, thus setting the resting distance refraction at emmetropia.