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Thanks. Might seem like an odd question but I was asking because the blinds look exactly the same on both sides and one of them has the blinds going over the roll and the other goes under the roll so wasn't sure.

I usually sit next to a window at home and I hear that 80% of UVA penetrates glass and UVA is what causes aging. So my skin has been exposed to unecessary aging for years. I bought blackout shades. But I am concerned that they might be facing the wrong way. My question is. If blackout shades/blinds face the wrong way 1)would more UVA penetrate into my apartment than if they faced the right way? 2) IF UVA does penetrate, would it then bounce off the the walls and hit the blackout shades (which are facing the wrong way and which allowed UVA im) and then reflect back onto my skin again - so then my skin would be hit by twice as much UVA than it would if I had no blackout shades at all?