Tolarations For Uncut Lenses

Turkish Standard of EN ISO 8980-2

Power Tolarations On Lenses Values are in Dioptries.

Tolerance and Return 02.jpg

Tolerances in Cylindrical Axis Direction

Tolerances in Addition

Tolerances in Optical Centralization
and Prismathic Power

Material And Surface Quality

Assessment: There should be no defect that may prevent the vision inside the lenses or on the surface within an area of 30 mm in diameter centered near the prism reference point.  Minor defects inside and/or on the surface of the lenses outside this area are acceptable.