Lens test, optical correctness

If glasses distort your vision, the result is headache and fatigue. For all of Filtral’s sunglasses and reading glasses,
we therefore ensure the highest surface quality without streaks, inclusions or air bubbles. For sunglasses absolute optical correctness is generally achieved. Due to technical reasons, slight deviations may occur with extremely
curved lenses.

The test proves it: hold the glasses about 20 - 30 cm away from your eyes and focus on a straight line.
Only if this line is not distorted, the perception is true-to-life and optically correct.

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