Does Material Abbe Value Influence Your Patient’s Vision?

By Dick Whitney – Carl Zeiss Vision
Executive Director – Optical Heritage Museum
Chair of ANSI Z80.1 and the Vision Council Lens Technical Committee

Monday, September 14, 2015 9:11 AM In a recent Opticians Handbook article, I discussed the topic of reference wavelength. A key aspect of understanding reference wavelength dealt with differences in refraction properties of various materials for different wavelengths of visible light. Specifically, in the presence of prism, “white light” is broken up into the familiar rainbow. In general, the higher the index of the material, the more these colors are observed because of the material Abbe value.

Controlling Myopia In Children

By Barry Santini, ABOM
Wednesday, August 26, 2015 12:06 PM

What’s Causing The Increase In Myopia? Here the experts rarely all agree, Most feel that parental genetics are important in determining whether any individual becomes myopic, but in view of the worldwide increase in myopia, researchers often place genetics behind these common suspects...

Controlling Myopia In Children

By Barry Santini, ABOM
Wednesday, August 19, 2015 2:00 PM Within the last 20 years, both the prevalence of myopia and its rate of increase within the world’s population are rising. It is estimated that 33 percent of the U.S. population is myopic (defined as greater than -0.50D) and can range up to 80 percent in some Asian countries like Singapore and Taiwan.

Design of Iseikonic Lenses, Part Two

By Maggie Sayers, ABOM
Tuesday, March 11, 2014 11:30 AM The magnification created by any ophthalmic lens is determined by: Dioptric power, Vertex distance, Base curve, Center thickness and Lens material.

Design of Iseikonic Lenses, Part One

By Maggie Sayers, ABOM
Tuesday, February 18, 2014 4:00 PM The design of iseikonic lenses is a tool given to opticians to correct aniseikonia.

Human Vision, Saccades and Robots

By Ari Siletz
Wednesday, February 12, 2014 11:46 AM The human eye and the camera in an artificial vision system both function as image acquisition devices so they share important commonalities.

Caution: Prescription Changes Ahead

By Barry Santini, ABOM
Monday, March 25, 2013 1:46 PM When a patient presents an apparently large or abrupt vision change, an ECP's first thoughts are to caution the patient to "please see your eye doctor as soon as possible" or "let me see when we can get you in."

More About 20/20

By Staff
Monday, November 21, 2011 11:22 PM Possessing optimal vision permits us to more fully enjoy ourselves.

Who Wears What Kind Of Lens

By Staff
Wednesday, November 9, 2011 11:33 PM If the patient has no refractive error or does not need glasses, refractive condition is called emmetropia or normal vision.

The Prescription and Vision

By Staff
Wednesday, November 9, 2011 11:20 PM It starts with the prescription. The prescription (Rx) describes the patient’s Refractive Error. Any Prism needed for the eyes to work together and an Add if needed for near vision/reading.