DESCRIPTION:
A spectacle is mounted horizontally onto the test unit, with outer lens facing down. One lens is clamped in position, whilst a vertical force is applied to the other lens. After the force is removed, the amount of permanent deformation of the tested side from the horizontal is measured and compliance assessment is performed
APPLICABLE STANDARD:
ISO 12870 Ophthalmic optics — Spectacle frames — Requirements and test methods.Clause 8.4