Glasses, also known as eyeglasses or spectacles, are devices consisting of glass or hard plastic lenses mounted in a frame that holds them in front of a person's eyes, typically using a bridge over the nose and arms which rest over the ears. Glasses are typically used for vision correction, such as with reading glasses and glasses used for nearsightedness. Safety glasses provide eye protection against flying debris for construction workers or lab technicians; these glasses may have protection for the sides of the eyes as well as in the lenses. Some types of safety glasses are used to protect against visible and near-visible light or radiation. Glasses are worn for eye protection in some sports, such as squash. Glasses wearers may use a strap to prevent the glasses from falling off during movement or sports. Wearers of glasses that are used only part of the time may have the glasses attached to a cord that goes around their neck, to prevent the loss of the glasses. In early embryonic development, an oversight can take place giving the embryo some cells with two X chromosomes and several with three X chromosomes. Luckily, both types of cells continues to divide and since not every cells have the abnormal amount of X chromosomes the female is only going to experience mild, if any, symptoms. Does tattoo removal actually work? Are all those methods effective? The answer is that every than it depends. The fact is that you will find just a few rare colors that can't be removed using laser methods. This includes colors like turquoise, pale green and yellow. However, black tattoos are the easiest to get rid of. It is important to utilize a tattoo removal method which is effective and provides results with minimum amount of risk.