| 摘要 |
<p>A computer indicated lens movement direction protocol is utilized in combination with a lensmeter to designate required movement of lenses with respect to a lensmeter to insure sequential measurement of progressive addition lenses. Lens measurement occurs at four sample points closely spaced on the lens surface. The system uses power variations (PV1 and PV2) at each of the spaced apart lens sampling points to indicate when sampling of the lens occurs in a region of constant spherical power, when sampling of the lens occurs in a region of changing spherical power, and finally when sampling again occurs in a region of constant and increased spherical power. When sampling of the lens occurs in a region of changing power, lens movement is guided along a path of constantly changing sphere utilizing changes in astigmastim measured in the 45° - 135° directions (Cx). A lens examination protocol is set forth with vector indicators setting forth the vertical direction required for movement as well as both desired left and right movement to maintain the shortest possible path between the respective lens portions.</p> |
