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In the case of virtual-try-on of eyewear, the benefits are manifolds for both customers and optical stores. From the point of view of the client: the unique high tech buying experience, the quick and easy way to select frames, the time saved on frame pre-selection, the possibility to share the frame selection with family and friends, the ability to see himself with new frames without lenses, the fast virtual try-on of new collections, and the private selection by Internet without obligation or embarrassment. From the point of view of the optical store: the augmented attractiveness of the store due to a unique purchasing experience, the reduced number of rejected frames due to accurate measurement, the saving on stock by holding less frame inventory, the extended availability of large collection of frames due to the virtual inventory, and the optician time saved by obtaining pre-selection of frames by the client. 
4.3 Size surveying
Recently, human body size surveys have become a complete necessity. All institution and companies working on ergonomics are expecting information for practical immediate exploitation. In fact, it had been realized that anthropometric data could improve the quality of product design and usability, workstation and work place planning, and even laborer safety in certain environment. In the fashion industry, this information is used to tailor the size and shape of cloth items to stature and body form of the actual population.
National surveys have been initiated in the past in UK (SizeUK, 11'000 subjects scanned, 130 body measurement for each subject), in USA (SizeUSA), but recently also in Sweden and in France17. The standard posture used in all surveys features the legs and arms slightly apart of the human body, elbows and hand joints slightly bent. This to allow an automatic determination of the important anthropometric measures of the human body (ISO7250). The most recent size surveys (Sweden and France) have added additional sitting and standing postures. New surveys lunched in China also added the 3D measurement of hands and feet. 
4.4 Anthropometric mannequins
The shape of anthropometric dummies are based on statistical studies and recently on the results of size surveys. These special dummies are available commercially for babies, kids, teenagers at any growth stage, as well as men and women in many morphological conformations, from slim to extra heavy, with dimensions based on worldwide morphology market research. The anthropometric dummies represent exactly the conformations present in the population and assure that apparel collections are tailored to today's customer stature and form.
Figure 20 shows some examples of anthropometric mannequins. Different variations exist in the market regarding the form (fix mannequins, fully articulated), as well as regarding the employed materials. In some cases, special materials simulate the behavior of soft tissue.
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