Thank you for your feedback, no worries, this type of situation can be easily resolved.
The thinness of our lenses is a technical choice on our part: we use Tri-Acetate Cellulose (TAC), a polarizing material that offers lightness, optical clarity without prismatic distortion, shape memory, and good shock resistance.
Regarding the curvature, our lenses are designed to faithfully fit the shape of the selected frame model. The model you ordered comes in several variations (sizes and curvatures), and it happens that the chosen reference does not exactly match your frame, which would explain both the observed gap and the difference in concavity.
To verify together, could you send us a photo of the inside of the arm of your glasses to the address
[email protected]? The exact reference is inscribed there (brand, code, dimensions). As soon as we receive it, we will get back to you with the right solution.