Ophthalmic lens

摘要

The lens has a cross mark located above a prism reference point. Standard deviation less than 0.12 microns per diopter is calculated as an absolute value of difference in values of mean square deviation between pairs of symmetric points with respect to a vertical axis passing through the cross mark. The standard deviation is measured in an area including a far vision control point and defined by a semicircle centered on the cross mark. Independent claims are also included for the following: (1) a method for correcting a vision of presbyopic subject (2) a method for mounting an ophthalmic lens in visual equipment.