I found the following sentence on the internet.
I wonder if the syntax is grammatically correct.

However, the images tend to fade the longer they remain blind.

I think it shall be "However, the longer they remain blind, the more the images tend to fade."
I have not heard one of the comparatives can be left out in "the more ~ the more" structure.
Original Post
I think it should be ...

Hello, Yun! Smile

Even though not nearly as common a construction, this is an acceptable alternative. Here are some other examples from a Google search. (The first two are headlines):

"Blood clot risk goes up the longer you travel."

"High Adherence May Become Less Essential the Longer a Patient Maintains Viral Suppression on HAART, Findings Suggest."

"The percentage of obesity and overweight for foreign-born people increased the longer they lived in the U.S."
Dear Richard,

Thank you very much for the answer.
Now I understand the example I picked up can be considered as a kind of variation of "the more ~ the more" syntax and it is widely used by native speakers.
However, I still have a question if it is accepted as a good formal expression.
For instance, if I use this sentence structure when I write an essay, does the English teacher consider it a good sentence?
That's an interesting question, Yun. It's often very difficult to make such a call since judging a construction like the one in question can be very subjective.

My advice is to use the more common construction in your writing; that way nobody can "fault" you for using a less commonly occurring one. Your rewrite of that sentence is a safer way to go.

On the other hand, should any teacher want to fault you on the variation, all you'd really need to do is cite examples on Google or some other search engine just as I have. Wink

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