While it is possible that manufacturing could contribute, if the quality control is done and the tolerances are withing the design specs and it fails then it is a design issue. A better design would handle a significant amount of extra stress in this part of the goggles.
Not a design defect a mfg defect. Glass doesn’t split perfectly like that if it’s a design issue imo.
While it is possible that manufacturing could contribute, if the quality control is done and the tolerances are withing the design specs and it fails then it is a design issue. A better design would handle a significant amount of extra stress in this part of the goggles.