Since the lens does not transmit U.V., then further elimination of it can hardly have any effect. The final claim is a repetition of a rumour that has had some currency in recent years. This idea probably dates from the publication of a paper in 1977 which investigated the transmission of U.V. through materials used to make sunglasses and then drew some hasty conclusions. The calculations necessary to evaluate the amount of U.V. entering the eye in the presence and absence of sunglasses is very complex. For all commercial eye protection made of glass, the U.V. irradiation of the lens is reduced in spite of the increased size of the pupil .
Consumers have many problems in deciding how to spend their money.
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