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Glasses tod |
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Добавлено fectguarrocell1976, Суббота, Май 24, 2014 - 22:08 |
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Glasses today are made of fibre glass, which can be molded and controlled in very fine ways (thickness, pigments, strength, optical properties etc) to get many different shapes, sizes and shades to match exact specifications. Rimless glasses are possible because of a fine groove that can be made in the plastic. During Gandhi time however, glasses were steel rimmed and built to last, and the lens was made of glass it had to be ground on a abrasive surface to fit the frame. This grinding required skill and fine tools. Round glasses without any drastic changes in curvature or sharp corners are easier to grind, which is why round or oval frames are popular instead of shapes with well defined corners for frames which use glass lenses.
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