Oral contraceptive pills are separated into two categories combined pills, which can be typically referred to as "the pill" and also the mini pill. This division is conducted on such basis as female hormones in the pills. Combination pills or pill includes two artificial female hormones that allow the crooks to protect women against pregnancy in three ways. The mini pill, that is mistakenly think that the light source dose combined pill, is really a single artificial female hormone and works completely independently to stop pregnancy. Smaller pills usually prevent sperm from entering the uterus and in addition customize the lining in the uterus to prevent pregnancy. 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.