US Patent Issued to Alcon on March 31 for "Multifocal diffractive ophthalmic lenses with evenly spaced echelettes" (Texas Inventors)

ALEXANDRIA, Va., March 31 -- United States Patent no. 12,591,149, issued on March 31, was assigned to Alcon Inc. (Fribourg, Switzerland).

"Multifocal diffractive ophthalmic lenses with evenly spaced echelettes" was invented by Behzad Bordbar (Fort Worth, Texas) and Kamal K. Das (Arlington, Texas).

According to the abstract* released by the U.S. Patent & Trademark Office: "Certain embodiments described herein are directed to a multifocal ophthalmic lens including a base lens having a base curvature corresponding to a base power, and a diffractive structure comprising a central zone and a plurality of annular echelettes formed on a first surface of the base lens. A radial spacing of each of the plurality of annular echelettes is constant th...