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.
If (in addition to itching) your eyes are burning, the cause may be dry eye syndrome or meibomian gland dysfunction, not allergies. Similarly, if your eyelids are red and inflamed, you may have a condition called blepharitis, which is caused by bacteria and in some cases by microscopic mites that live on the eyelids.