Quote:
Originally Posted by javadog
It's not a scratch. It's some interaction with the various layers in the glass. Probably not fixable without changing the windshield.
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Probably this. Light refracts as it passes through glass. That's how eye glasses work, as we all know. Glass and all other transparent substances have a specific refractive index (RI). The windshield probably has outer layers with different RIs than the inner glass layer. This causes concentrated light where you are seeing it, only occurring at one small range of angles in relation to your eye. It's kind of like a rainbow, except the light isn't getting split into different colors. If all layers had the same RI, this wouldn't happen.