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Structured light is widely researched in tridimensional profilometry, due to its capability to acquire surface data from a series of images in a fast and reliable way. Hence a wide range of techniques are being used for such purpose, among which are the use of color to encode patterns. The use of colorcoding provides the ability to obtain additional data from a single image, to achieve faster 3D reconstructions with higher resolution. In this paper, a new classification of color-coded structured light patterns is proposed, and a review of the techniques is presented.

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Spectacle lenses are the most commonly used solution for refractive errors of the eye, such as myopia, hyperopia, presbyopia and astigmatism. To correct a refractive error, the spectacle lens needs to have the correct lens power and an appropriate distribution of power along the surface of the lens, to measure these characteristics several methods have been developed, this paper presents a review of some of these methods and their optical principles.