Best form lenses for near vision - an innovation - 1 interactive CET point
12:00 - 13:00
With the advent of free form manufacturing technology it has become possible to correct off-axis aberrations of spectacle lenses to a far more accurate degree. This talk describes the difference between the aberrations exhibited by a lens in distance and near vision. It describes the methods by which the usual best form lens for distance vision can be modified to fully correct the aberrations in near vision and an exciting new design which has combined both corrections in a single lens.
Spectacle lens aberrations
Difference between form of lenses for distance and near vision.
Aberration correction by means of aspherical surfaces
New lens designs offering best form performance in both the distance and the near portions of the lens.