Valdemar Portney

Title: Valdemar Portney and a Diffractive Multifocal Ophthalmic Lens

Introduction

Valdemar Portney is an inventor associated with Newport Coast, California. His listed patent work concerns an ophthalmic lens designed to provide multiple focal points through a compact diffractive zone.

Latest Patents

Portney is credited with 1 patent, titled “Diffractive Multifocal Small Aperture Ophthalmic Lens.” The patent describes a transmissive lens with a centrally positioned diffractive multifocal zone on one surface, surrounded by a peripheral refractive non-multifocal zone. The opposite surface is also refractive and non-multifocal.

The peripheral zone contributes to the far focus, while the central diffractive zone produces both a far focus and an Add focus. The diffractive zone is specified as no more than 2.5 millimeters in diameter and at least 1.5 millimeters for Multipeak performance. The design may use only two grooves, and at least 20 percent of the light within the diffractive zone is directed to either the far or Add focus. Its base curve and aspheric grooves are configured to support far-focus performance and minimize spherical aberration at the Add focus.

Career Highlights

The patent reflects work on optical design for multifocal vision correction, particularly the use of a small diffractive aperture alongside refractive lens regions. The described features aim to balance focal performance and control optical aberrations.

Collaborations

F. Richard Christ is identified as Portney’s coworker. The supplied information does not specify his role in the patent or the nature of their collaboration.

Conclusion

Valdemar Portney’s listed patent presents a multifocal ophthalmic lens design that combines diffractive and refractive zones to provide far and Add focus performance.