Prolonged exposure to ultraviolet light seems to be an important cause of cataracts, a frequent disorder in elderly patients. An extracted lens should be fixed, embedded in paraffin wax and cut in two halves in the antero-posterior direction. Slides can be made by sectioning the cut surface. Cutting the lens before processing can cause artefacts. In cataracts of the elderly degenerated lens fibres form discrete globules and the epithelium covering the inner surface of the anterior lens capsule may extend to the posterior part of the lens. Similar observations are made in cataracts in children .
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