The new Total Refraction System, TRS-3100, is a feature-streamlined instrument that offers completely wireless interface with the autorefractor and autolensmeter. The built-in IC Card Reader allows ...

First proposed over thirty years ago, negative refractive index materials bend light in the opposite direction to ordinary materials. However, they were not demonstrated experimentally until 2000.

A refraction test is usually given as part of a routine eye examination. It may also be called a vision test. This test tells your eye doctor exactly what prescription you need in your glasses or ...