AR Lenses

By Ari Siletz
Wednesday, January 14, 2015 11:00 AM This article is about how anti-reflection coating reduces reflections from eyeglass lenses. But before we go there let's ask a more fundamental question: Why does glass reflect in the first place, after all, isn't glass supposed to be transparent?

Human Perception of Color

By Ari Siletz
Tuesday, September 30, 2014 2:30 PM Sunsets are red and so are tomatoes, yet these two reds are quite different. The word "red" by itself doesn't carry enough information to uniquely identify a particular sensation of color.

A Brief Look at the Theory of Color Perception

By Ari Siletz
Tuesday, July 22, 2014 10:00 AM Different wavelengths of light (electromagnetic waves) create different sensations of color. For example, objects that reflect wavelengths of light in the range of 620 to 750 nanometers (roughly 200 time smaller than the width of a human hair) appear red/orange to us.

The Physics of Polarizing Filters

By Ari Siletz
Monday, June 16, 2014 1:00 PM To see how polarized sunglasses work, it is convenient to think of light as a wave moving along a string. Just like a wave on a string, a light wave wiggles transversally to its direction of motion. And just like a wave on a string, the plane in which the string oscillates can have different orientations.

White Is In The Eye of The Beholder

By Ari Siletz
Wednesday, June 11, 2014 11:00 AM To see how white balancing algorithms work in a computer (or digital camera) it's important to know what we mean by "white." First of all, "white" is relative. Something that looks white will look gray when compared to a brighter "white."

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.

A Double Take On 3D Vision – Does It Give You A Headache?

By Ari Siletz
Wednesday, December 18, 2013 10:40 AM Strolling out of the theater after seeing the recent 3D movie, Gravity, my friend wondered why she felt slightly dizzy every time she watched a show in 3D.

Two Short Kids and Two Photons

By Ari Siletz
Wednesday, October 16, 2013 11:00 AM Children waiting in line get on an amusement park ride dread the sign that says "You Must Be This Tall to Ride." Particles of light (photons) on their way to break a molecular bond run into a similar problem.

Is The Human Eye Well Designed?

By Ari Siletz
Tuesday, August 27, 2013 7:43 PM During courses in lens design one sometimes hears that the human eye is a poor performer when it comes to image quality.

Index of Refraction Explained By A Race?

By Ari Siletz
Wednesday, August 14, 2013 5:26 PM An optician, a nurse, and a pharmacist are competing in a reality show. A coffee thermos is left floating just offshore from the beach and the first one to reach it gets a hot cup of coffee.
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