https://www.avient.com/sites/default/files/2021-11/avient-design-ergonomic-design-guide.pdf
An early 3D printed prototype tests
the one-sided gear mechanism
that moves the curved lens to dial
in the best corrected visual acuity.
Testing standards may vary by country.
The following best practices for
overmolding a TPE material can help you improve
processing success.