Johnson and Johnson Vision Care, Inc.

University of Arizona

Canadian Space Agency

John Edward Greivenkamp, Jr

Gregory A Williby

Russell T Spaulding

James William Haywood

Kyle Heideman

Russell J Edwards

Simon Prince

Robert E Fischer

Larry G Jones

Bruce M Pixton

Greg Moeller

Paul Hudson

Brian C Primeau

Andrew E Lowman

Michael Sherwood

Syed Tariq Shafaat

Shawn Mulcahey

John C Hootman

Russell Spaulding

A computer, a high resolution monitor and a patient interface is utilized to implement a visual contrast sensitivity function measurement test. More specifically, a computerized video system is configured to implement a tilted-grating forced choice contrast sensitivity function test. The invention utilizes known measurement methods for the visual contrast sensitivity function and automates their use by computerizing the system and couples it with a patient-interactive user interface in order to produce an accurate quantitative result.

System and method for the rapid measurement of the visual contrast sensitivity function

The system and methods are made to apply interferometry to ophthalmic applications. The system makes use of a low-coherence interferometer to obtain a plurality of measurements of a contacts lens. The system and methods characterizes the surface profile of both surfaces of a contact lens, a thickness profiles, and combines these measurements with an index information to reconstruct a complete model of the contact lens.

Interferometer having a reference fluid tank with a prism and a motion matching window for characterizing a contact lens

Characterizing the surface of a contact lens with an immersed reference prism

Measuring ophthalmic lens using a prism with phase shifting mirror and a fluid in reference arm

An apparatus and method to improve the prescribing of customized ophthalmic corrections which contain higher order aberration. The apparatus enables the subjective measurement of higher order aberrations such as spherical aberration which can be used as part of the prescription for customized ophthalmic corrections.

Apparatus and method to obtain clinical ophthalmic high order optical aberrations

An in vivo method of characterizing dynamic tear films has been developed using a near infrared phase-shifting interferometer. This interferometer continuously measures light reflected from the tear film, allowing precision analysis of the dynamic surface topography. Movies showing the tear film behavior may be generated along with quantitative metrics describing the tear film surface as it changes in time.

System for in vivo analysis of tear film in the human eye via phase shifting interferometry

Modified MZ (Mach-Zender) interferometers are utilized to analyze the transmitted, aspherical wavefront of an ophthalmic lens by mounting the lens in a cuvette having a rotatable carousel that can hold multiple lenses. Fresh, temperature controlled, saline solution is circulated about the lenses, and the cuvette is positioned in a vertical test arm of the interferometer configuration. Reverse raytracing is utilized to remove aberrations induced into the wavefront as it is imaged from immediately behind the lens to the detector of the interferometer.

Cuvette for ophthalmic lens

Modified MZ (Mach-Zender) interferometers preferably are utilized to analyze the transmitted, aspherical wavefront of an ophthalmic lens by mounting the lens in a cuvette having a rotatable carousel that can hold multiple lenses. Fresh, temperature controlled, saline solution is circulated about the lenses, and the cuvette is positioned in a vertical test arm of the interferometer configuration. Reverse raytracing preferably is utilized to remove aberrations induced into the wavefront as it is imaged from immediately behind the lens to the detector of the interferometer.

Interferometry testing of lenses, and systems and devices for same

A finite impulse response digital filter is designed for boosting mid-spatial frequencies as opposed to the frequencies near the sensor resolution limit. The digital filter's boost is centered on frequencies at about half the Nyquist frequency. To prevent over-boosting or enhancement of noise, the detail signal can be run through a coring filter to remove any low amplitude detail signal that resulted from noise.

Mid-spatial frequency digital boost filter

Growing community of inventors

Tucson, AZ, United States of America

John Edward Greivenkamp, Jr