Rear window distortion - almost like a Fresnel lens

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MelindaV

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If the distortion isn't due to heat, then why would the distortion only appear with the defroster on? I suspect the refractive indices of the different layers in the laminated glass aren't changing uniformly with heat.
agree, I don't notice any distortion when the rear defrost is off, or still warming up (maybe because it is still foggy), but once the window is fully heated and the glass is clear of any fog, the view is slightly distorted.
My previous cars did not have laminated rear glass, so did not notice any change between the defroster being on/warm or off/cold.
 

Bokonon

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Not sure if it's true on every car, but for at least a number of us, the rear window looks kind of wavy/distorted when looking out the rearview mirror. This happens after the rear defroster has been on for several minutes regardless of whether the window was fogged or not. The laminated glass seems to optically distort along the defroster lines due to the heat.
agree, I don't notice any distortion when the rear defrost is off, or still warming up (maybe because it is still foggy), but once the window is fully heated and the glass is clear of any fog, the view is slightly distorted.
My previous cars did not have laminated rear glass, so did not notice any change between the defroster being on/warm or off/cold.
I moved this discussion to an existing thread on rear-window distortion. In particular, see @Triangles' detailed post here describing the cause of the distortion, why it appears to be more pronounced on the Model 3 than on other vehicles, and why Tesla may have decided to manufacture the rear glass this way.
 

MelindaV

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I moved this discussion to an existing thread on rear-window distortion. In particular, see @Triangles' detailed post here describing the cause of the distortion, why it appears to be more pronounced on the Model 3 than on other vehicles, and why Tesla may have decided to manufacture the rear glass this way.
I'll just add, I don't find the distortion to be an issue or otherwise problematic. if anything it is a reminder that my rear defrost was forgotten and left on beyond it being needed.
 

Long Ranger

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I moved this discussion to an existing thread on rear-window distortion. In particular, see @Triangles' detailed post here describing the cause of the distortion, why it appears to be more pronounced on the Model 3 than on other vehicles, and why Tesla may have decided to manufacture the rear glass this way.
I don't agree with moving this to the distortion thread. Maybe I wasn't too clear of my intent by posting in the other thread, but I wasn't intending to complain about the distortion or get into the reasons for it. I was trying to give @nonStopSwagger a tip for diagnosing whether the defroster works by simply looking for this distortion. No need to start with a fogged window, just turn the defroster on and look for this distortion after a few minutes.
 

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I don't agree with moving this to the distortion thread. Maybe I wasn't too clear of my intent by posting in the other thread, but I wasn't intending to complain about the distortion or get into the reasons for it. I was trying to give @nonStopSwagger a tip for diagnosing whether the defroster works by simply looking for this distortion. No need to start with a fogged window, just turn the defroster on and look for this distortion after a few minutes.
Sorry, when I first read your post (and the replies that followed), I didn't make that connection back to the OP's issue. Thanks for clarifying and tagging nonStopSwagger.
 

Long Ranger

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Sorry, when I first read your post (and the replies that followed), I didn't make that connection back to the OP's issue. Thanks for clarifying and tagging nonStopSwagger.
Not a problem at all. After rereading my original post, I realize it was poorly phrased. I didn't spell out my troubleshooting suggestion and it reads like a typical problem report.

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