The key to the procedure is a specially tuned laser that destroys the natural brown pigment melanin in the iris, the eye's central colored portion.

手术的关键是一种特殊的调谐激光器，它可以破坏虹膜(眼睛中部有颜色的部位)内天然的“褐色素”内的黑色素。

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Recent experimental evidence has shown that laser pulses tuned to the right frequency can kill certain viruses.

最近的实验证据表明，调到适当频率的激光脉冲可以杀死特定的病毒。

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"We use a laser, and it's tuned to a specific frequency to remove the pigment from the surface of the iris," Homer says.

霍姆医生说，“我们用激光技术，把它调到特定的频率，去除虹膜表面的色素。”

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To activate the altered neurons, they usually use a laser tuned to the proper wavelength and pipe the beam through a fiber-optic cable implanted in the brain tissue.

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The wavelength of the laser light can be tuned to interfere only with u-235 and "excite" the molecules, raising their energy level.

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Moreover, such a laser can be fine-tuned over a smaller range of wavelengths simply by varying its temperature.

ECONOMIST: Lasers