# Rear view mirror plus sunglasses question.

**URL:** <https://boards.straightdope.com/t/rear-view-mirror-plus-sunglasses-question/194255>\
**Category:** Factual Questions\
**Created:** [August 10, 2003, 9:18pm UTC](https://boards.straightdope.com/t/rear-view-mirror-plus-sunglasses-question/194255 "2003-08-10T21:18:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![TV\_time](https://avatars.discourse-cdn.com/v4/letter/t/f17d59/32.png) [@TV\_time](https://boards.straightdope.com/u/TV_time)\
**Post date:** [August 10, 2003, 9:18pm UTC](https://boards.straightdope.com/t/rear-view-mirror-plus-sunglasses-question/194255/1 "2003-08-10T21:18:00Z")

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When I look through my rear view mirror and I am wearing sunglasses the back window on my car appears to have a crosshatched pattern to it. Why is that?

I tried doing a search on it believing I am not original enough to come up with a new question but I was unable to find anyting. That probably stems from my incompetitence dealing with searches though.

TV

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**Author:** ![Fritz\_The\_Cat](https://avatars.discourse-cdn.com/v4/letter/f/f17d59/32.png) [@Fritz\_The\_Cat](https://boards.straightdope.com/u/Fritz_The_Cat)\
**Post date:** [August 10, 2003, 9:41pm UTC](https://boards.straightdope.com/t/rear-view-mirror-plus-sunglasses-question/194255/2 "2003-08-10T21:41:51Z")

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I would venture to say the sunglasses you are using are polorized? When you look at glass that is heat tempered through polorized lenses you will see a hatch pattern. You can sometimes see this affect on glass store front doors as well.