What is the strange mark on the lenses of my new glasses? (---)?

Question:

I just bought a new pair of glasses last week and I noticed on my lenses that there is a mark that looks like two parenthesis with a solid line in the middle. (---) It looks something like this. I've never noticed it on the lenses of previous pairs of glasses, but my mother said she noticed that her lenses have the same mark. What is the point of this mysterious mark on the lenses of our glasses?

Answers:
I work in optical, I am an optician, I help do adjustments and repairs...

Those marking you are seeing are the progressive markings. They are on all progressive lenses. (no line bifocals) They identify what type of progressive lens, sometimes the lens material, and where the progression is in the lenses. Also, one on side of the lenses there will be a #. That tells us what the add power of the lens is. Most of the time you cannot see those markings unless you are trying to find them, but there are some lenses where the marking are more prominant.

if you gotten the type that darkens by itself or transition lenses, that is the "sensor" of the glasses for it to work..

I ask my optician the exact same question when i bought my first transition pair of glasses.

My glasses had that on them as well. I think it is a line representing line of vision, but I have no technical back up.

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What is the strange mark on the lenses of my new glasses? (---)?

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