Identical twins originate from one particular egg that's been fertilized by one sperm. For unknown reasons, the fertilized egg splits into 2 or more embryos during the first stage of development. Some identical twins share the same placenta. However, they generally grow within separate amniotic sacs inside the uterus. In rare cases, identical twins share one amniotic sac (monoamniotic). 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. Cervical spondylosis, also known as degenerative osteoarthritis, cervical spondylitis affects the joints and bones of the neck, which can cause pain and stiffness. The bacteria is present in to the bladder,urethra and kidney. When the bacteria gets exposure to the urine, it multiply inside and accross its rejection with urine out of body, it contaminates the urinary tract and results in how it's named the urinary tract infectio(UTI) and symptomised by an urge to urinate along with a sensation of burning through the urination and subsequently with intermittent passing small burned numbers of urine.