TY - JOUR
AU - , MARK P.
AB - contact lens case reports BY PATRICK J. CAROLINE, FAAO, & MARK P. ANDRÉ, FAAO with a posterior aspheric design n the world of multifocal GP lenses, there are manufactured in a traditional GP index material (yellow line) and a basically three types of simultaneous vision lens- higher-index material (green line). On eye, the effective add es. In the United States, the most used designs power will be proportionally less incorporate anterior and/or posterior aspheric due to the index of refraction of the tears. Figure 3 illustrates a optics to generate the distance obstacle is that pupil diameters similar increase in add effect and near corrections. The success decrease with age, a mechanism when anterior aspheric lens de- of the aspheric designs is often called senile miosis. predicated on two factors — lens centration and pupil size. New GP Materials Today, we address the centra- It’s often stated that aspher- tion issue by incorporating larger ic GP lenses perform best at overall diameters, similar to those near when minor (upward) used in orthokeratology. Howev- translation occurs. Unfortu- er, one of the more overlooked nately, an aspheric lens that anatomical features is pupil diam- decenters induces a signifi- eter, which can 
TI - Aspheric Lens Design Success
JF - Contact Lens Spectrum
DO - 10.1097/01.CLS.0000344231.68156.54
DA - 2009-01-01
UR - https://www.deepdyve.com/lp/wolters-kluwer-health/aspheric-lens-design-success-Gp0v8y5obF
SP - 56
EP - 56
VL - 24
IS - 1
DP - DeepDyve
ER -