HD
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Opto Tech HD Progressive Lenses
The OptoTech HD progressive lens design concentrates the unwanted astigmatism into smaller areas of the lens surface, thereby expanding the areas of perfectly clear vision at the expense of higher levels of blur and distortion. Consequently, harder progressive lenses generally exhibit the following characteristics: wider distance zones, narrow near zones, and higher, more rapidly increasing levels of surface astigmatism (closely spaced contours).