Later, circular needles were invented, which can also be used to knit in the round: the circular needle looks like two short knitting needles connected by a cable between them. Longer circular needles can be used to produce narrow tubes of knitting for socks, mittens, and other items using the Magic Loop technique.
Occasional burning and itching of the eyes is often the result of a foreign substance in the eye. Once the substance is removed, the burning and itching will subside and other symptoms will disappear relatively quickly. Sometimes these symptoms develop in response to temporary irritants such as cigarette smoke or dust.
Another common symptom of itchy eyes is eye fatigue. It can cause itchy eyes, as well as sore or tired eyes. You may also have blurred vision, watery eyes, or be more sensitive to bright lights. See your doctor right away if you have double vision.