This is a short video of what an autorefractor does when it determines your eyeglasses or contact lens prescription. It is abstract but you can see the infrared beam and changing focus as the eye computer analyzes the wavefront from the optical system of your eye. The final determination tells us the amount of nearsightedness, farsightedness, and astigmatism you have. The cross pattern is the infrared beam that you will not see when the instrument is measuring, however it evidently has enough visible red light to show up on video. The circular pattern of lines are the image you will see and watch as amazingly it clears and comes into a crisp focus as the autorefractor works away with it’s complex algorithm. This technology greatly enhances our ability to determine your prescription with pinpoint accuracy.