how weirdly specific.

Define "too much weight". And then, still probably no. But I'm not an asshole either.

If they do, it isn’t because they are blind or not blind. Some people have internalized issues with weight gain, and it has nothing to do with their eyesight. I know some blind people who are as fatphobic as some of the most fatphobic sighted people out there.
Blind people have ideas of what they find attractive just like anyone else does, and the idea that they do not is a misnomer.

Slightly off-topic, but related to this question: the BMI scale is absolute bullshit. My weight has fluctuated quite a bit over the years due to a few different forces at work, and I have noticed one thing. BMI does not take into account pretty much anything. It doesn’t take water weight or the weight of your muscle into account at all, for one. For another, there can be large deposits of fat on your body that are just going to be there, whether you like it or not. People with larger breasts come to mind.
Also, weight distribution makes different amounts of weight look different from person to person. I weigh about 150 pounds right now, but, by all accounts of the sighted people I am in close proximity to, I look maybe 125.
Lastly, please take care of yourself. It sounds like you are struggling a bit with your self image, and I hope you can find the support every person deserves.

Not married but I wouldn't really care. I mean the 5-15lbs girls don't like, I would honestly not even care. Now if we're talking 50+, OK maybe we need to get an action plan going on.

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There's also the circumstances surrounding it. I mean if she just had my baby and is going through some postpartum depression and so on, I'm not gonna be like hey babe, we needa talk about your um... love lumps, because that would just be cruel.

No, because most humans, blind people included, aren’t judgmental assholes. There certainly art some humans who would be seen by most as being a judgemental asshole, but it’s not the vast majority of humans. Most people would know that even claiming to their friends, that they divorced their spouse because their spouse got too fat, would make them undesirable in their friends group, and undesirable to future mates. Most humans are not willin to take on such a stigma lightly. We are social creatures after all, and reputation means a lot.

I think personally that if my partner decided after we got married to totally let herself go and gain weight to the point that her medical bills were life ruining I would think about it. But a bit of weight gain is natural and shouldn’t be marriage ending in most cases. If she’s just a bit chubby love her for who she is

Considering my attractions, absolutely not.

I hate to say it, but I actually might. It would depend on the circumstances I think. If he went from being average weight to heading towards obesity, yeah, it'd be a turn off for sure.

I've grown unconcerned with my appearance since my vision loss and my wife occasionally comments on it. I doubt she'd ever divorce me over it, though.