Originally Posted by
Robert Martellaro
One of the reasons we should use the DPD for readers is to assure that the principal axis is intersecting the center of roation of the eye, minimizing oblique astigmatism and power error, especially with aspheric/atoric designs and/or higher powers.
WRT to induced prism, I use the DPD for myopes, and a compromise or NPD for older hyperopes, who most likely have less robust fusional reserves, and spherical lens designs. I suspect that using the DPD with a little base-in prism might be a better solution for hyperopes though, resulting in improved on and off-axis vision and visual comfort, allowing use of aspheric/atoric surface designs without compromise.
Does anyone make a free-form generated, optimized for Rx, POW, and work distance SV near only lens?