Lens e.g. ophthalmic lens, refraction characteristics e.g. spherical power, measuring method for e.g. optician, involves maintaining lens fixed with respect to lighting unit, where position of measurement axis is variable

摘要

The method involves measuring the deviation produced by a lens (L) to light rays, and determining the value of refraction characteristics of the lens at a measurement point. The lens is maintained fixed with respect to a lighting unit. The position of measurement axis is variable from one measurement from to anther measurement for adapting to that of the measurement point of the lens. An independent claim is also included for an apparatus for measuring refraction characteristics of a lens in a specific point.