To combat this terrible vision, I have special polycarbonate lenses, which makes them thinner than if they had been made from more traditional plastic lens material.  (Even then, my lenses are pretty thick.)

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This is why multi-colored Christmas lights can be bothersome to me.  If I look straight at blue lights, the light position is clear and centered.  But if I look through the edges of my glasses, the blue light “shifts” and appears to move.  In my case, the chromatic aberration is so bad that if I tilt my head in a certain way, I can see “purple” light separate into the red and blue counterparts.  It’s kind of cool, but also kind of disorienting.

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magnify ... To magnify an object means to make it appear larger than it really is, by means of a special lens or mirror. ... To magnify something means to increase ...

There are some ways to cut down on the chromatic aberration, such as using glasses with different dispersion components.  One part may separate the light out, but another could bend it back to “correct” the image.

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For example, consider the separation of white light in a prism.  White light is a made of all colors of light.  As white light enters and travels through a prism, the colors that make up the white light will separate out.  This is because each color has a different wavelength, leading to slightly different bends.  Red light has a larger wavelength that orange, which has a larger wavelength than yellow, and so on, down to the shortest visible light wavelength in violet.  In a traditional and triangular glass prism, red light travels faster than violet light.  The violet light is bent more than the red light as it travels through the prism.  By the time the parts of the “white light” leave the prism, they have traversed slightly different paths and exit the prism at different points.

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Do you think you can see chromatic aberration effects?  The image below consists of a red rectangle that contains a thinner blue rectangle.  If you look straight at the image, the blue rectangle should run down the center of the red rectangle.  If you slowly turn your head sideways while still looking at the image, and the blue rectangle appears to shift relative to the red rectangle, you also suffer from chromatic aberration.  Welcome to the club.

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Still, chromatic aberration effects may be unavoidable depending on the material and where someone is looking.  Some materials (such as my polycarbonate glasses) have higher dispersion, leading to more noticeable chromatic aberration that may be more difficult to correct.  This is particularly true in the peripheral parts of glasses.  Eyeglasses are designed to look straight through a central optical zone, and light travels differently through the edges of glasses compared to the center of glasses.  Looking through the edges of the lenses can change the bending angle of the light components.

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2024715 — 1300~2150nm, spectroscopically separated at 9.6nm interval with 192px for spectral info of 96bands.

And because of my lens choice and prescription, I experience a lot of chromatic aberration, which rears its ugly head with multi-colored Christmas lights.  Particularly blue ones.

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polarization, property of certain electromagnetic radiations in which the direction and magnitude of the vibrating electric field are related in a specified way.

Chromatic aberration is the failure of a lens (such as in eyeglasses or a camera) to focus every color to the same point.  This is the result of dispersion, the refraction or bending of light as it passes through a material.  The bending is determined by the material and the wavelength of the light passing through.

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Light waves are transverse: that is, the vibrating electric vector associated with each wave is perpendicular to the direction of propagation. A beam of unpolarized light consists of waves moving in the same direction with their electric vectors pointed in random orientations about the axis of propagation. Plane polarized light consists of waves in which the direction of vibration is the same for all waves. In circular polarization the electric vector rotates about the direction of propagation as the wave progresses. Light may be polarized by reflection or by passing it through filters, such as certain crystals, that transmit vibration in one plane but not in others.

So my vision is pretty terrible.  I am incredibly nearsighted, with a prescription around -8.0 in each eye. This means I cannot make out the “E” at the top of the standard Snellen chart.  I know it’s an “E.”  I just can’t really see it.  It’s a giant blur.

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In a lens, these bending differences can lead to different focal lengths, or how much the lens converges or diverges light.  In the image below, the blue light is bent at a higher angle than the red, causing the blue to meet and converge at a shorter distance along the dotted line compared to the red light.