Also known as annular contact lens, these contacts have an agreement of limitation in a bull's-eye pattern in which alternate in strength from near to far. Depending on your view of the needs of the center of the lens can be designed for near vision or far vision.
Also known as progressive lenses, this design works more like the progressive lenses, that is different prescriptive powers are located across the lens that allows you to see clearly at all distances. These lenses do not require an adjustment period, the eyes eventually learn to ignore near objects to focus distant objects and vice versa. Depending on your needs vision correction, the center of the lens is for near vision and the outside of the lens for distance.
Gary Philips
President, Quotable Quotes, Inc.
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