http://http://www.hotrod.com/techart...ics/index.html
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The biggie: windshield rake: According to Eaker, "Here's a myth I can bust. Once the windshield is past 45 degrees of rake-and many stock cars average like 60 degrees-you will not see an improvement from laying it down at an even steeper angle." We proved this on the Camaro, building a hugely sloped "windshield" out of foam core. It did nothing.
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The optical nature of glass is that reflection and refraction are complements. As one falls the other rises. Refraction is dominant normal to the surface, as the angle goes acute reflection overwhelms refraction. The dashboard may be covered with black velvet and there's still less light coming in from the outside.
Compound curved glass causes eye strain.