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To keep costs down, and because he was most comfortable around them, Hitchcock took most of his crew from his television series Alfred Hitchcock Presents, including cinematographer John L. Russell, set designer George Milo, script supervisor Marshall Schlom, and assistant director Hilton A. Green. [41]
Lead has been used as a makeup product since the 18th century. It is said to be lethal to women who apply it daily to achieve a pale complexion representing nobility, as tanner skin represents the working class. Lead can be detrimental to people's health and cause death if mixed with vinegar which it allows lead to be absorbed through the skin ...
There are more and more people wearing contact lens now and dry eyes appear to be the most common complaint among contact lens wearers. [ 80 ] [ 81 ] [ 82 ] Although both contact lens wearers and spectacle wearers experience similar eye irritation symptoms, dryness, redness, and grittiness have been reported far more frequently among contact ...
Wichterle thought pHEMA might be a suitable material for contact lenses and gained his first patent for soft contact lenses. In 1954 this material was first used as an orbital implant. In 1957 Wichterle produced around 100 soft lenses from closed polystyrene molds but the edges split and tore as the lenses were removed. In addition, they ...
However, magnifiers are not always used as described above because it is more comfortable to put the magnifier close to the object (one focal length away). The eye can then be a larger distance away, and a good image can be obtained very easily; the focus is not very sensitive to the eye's exact position.
Although most lenses are designed with fully automated equipment, such as computer-based generators, automatic edgers, and lens measurement instruments, a highly-skilled lab optician will often finish lenses by hand for more difficult prescriptions and lens designs in order to have the best-finished outcome.
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