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If Monet had stood perfectly still and only looked at the scene one time he might very well have seen such an image.

However, Monet painted things in his own garden. You can visit the place anytime.

He moved around (just like a normal human being), and looked at things from different vantage points, off and on, over a long period of time.

Monet knew what the pond, the lillies and the bridge in the garden looked like.

That means his visual problem occurred when he looked at his canvas on the easel.

He might well have had some problems with his palette ~ cataracts can be fun, of course, particularly when you get to the point where you have 3 to 5 overlapping images, of different intensities and hues.

Best to have your lens removed and replaced with a modern appliance.