Based on the provided reference, here's how to remove a lens from glasses with a plastic frame:
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Start at the top of the frame near the lens.
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Apply pressure on the bottom part of the frame near the lens.
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Give it some pressure to push the lens out. The lens should then come out of the frame.
It's important to note that this technique is described specifically for plastic frames. The method may be different for other frame materials, such as metal or semi-rimless frames, and attempting this on unsuitable frames could cause damage. If you are unsure, consult a professional optician.