ReviewPhotoprotection by window glass, automobile glass, and sunglasses
Section snippets
What is glass?
Glass is a mixture of sand, very high-quality silica sand added with other materials such as salt cake, limestone, dolomite, feldspar, soda ash, and cullet.14 The resulting mixture is called a batch (Fig 2). Glass is made through the melting and cooling of the batch. As the batch cools, it becomes a solid without forming crystals, thereby making glass transparent.
Float glass refers to glass made by pouring the molten batch from a furnace into a chamber that contains a bed of molten tin. The
Overview
Although glass effectively blocks all UVB radiation, UVA, especially the longer spectrum of UVA (UVA1), can still be transmitted. Photosensitive patients can experience exacerbations of their disease while driving or traveling by car. Transmission of UVR through automobile glass depends on type and tint of glass. For safety reasons, all windshields are made from laminated glass, which can filter most of UVA. However, side and rear windows are usually made from nonlaminated glass; therefore a
Conclusion
The degree to which glass products provide UV protection depends on the glass type, glass color, the presence of an interleave between pieces of glass, or the presence of a coating on the glass. Window glass is generally known to filter UVB. Darkly tinted and reflective window glass commonly used in commercial buildings has historically provided occupants of these buildings greater UV protection than occupants of residential structures, in which highly transmitting glass is predominant. Recent
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