METHOD OF CALCULATION OF AN OPHTHAMLIC LENS OF THE UNIFOCAL TYPE

摘要

An ophthalmic lens including: a prescription control point (P); an upper area having, relative to the point (P), and average-power continuous variation DeltaPuiSup that is monotonous between the point (P) and the point (Psup) (maximum variation point in absolute value) where the signed value of the variation DeltaPuiSupMax=Pui(Psup)-Pui(P) is between -0.1 and -0.4 dioptres; a lower area having, relative to the point (P), an average power continuous variation DeltaPuinf that is monotonous between the point (P) and the point (Pinf) (maximum variation point in absolute value) where the signed value of the variation DeltaPuiinfMax=Pui(Pinf)-Pui(P) is between +0.1 and +0.4 dioptres; the average power gradient being lower than 4.10-2×DeltaPuitotal, where DeltaPuitotal=|DeltaPuisupMax|+DeltaPuiInfMax. Such a lens advantageously takes the accommodative dynamics of the eye into account and increases the visual comfort of the wearer.