GFOUK Zpectrum Colorblind Glasses are specifically adjusted in increased intensity and vibrancy of colors, so as to activate an innate adaptation of visual receptors to heightened color levels. When the Zpectrum glasses is being worn, the visual receptors undergo neutralising adaptations and therefore generate up to 5x improvement in color vision. The visual receptors exhibit a remarkable ability to adapt and reorganize itself in response to sensory input. With consistent use, the brain may adapt to the enhanced color information provided by the glasses and improve the wearer's ability to perceive and differentiate colors. What makes GFOUK Zpectrum Colorblind Glasses Special? OUR GUARANTEE We are confident that we offer some of the best products on the market. Therefore, we provide a 30-day guarantee. We will make every effort to ensure that you are completely satisfied with your purchase. Online shopping can seem daunting. We want you to know that there is absolutely zero risk of purchasing something. We won't make it difficult if you don't love it. We offer email and ticket support 24 hours a day, 7 days a week. If you require assistance, please contact us. Please contact customer service if you have any problems with your purchase.