What is the primary optical reason for incorporating a standard pantoscopic tilt of approximately 8-12 degrees when fitting spectacles?
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A
To increase the effective vertex distance, which strengthens the power of plus lenses.
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B
To maintain the correct optical axis of the lens for both distance and near vision through the tilted lens.
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C
To lower the optical centers of the lenses, inducing base-down prism for reading.
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D
To bring the bottom of the frame front closer to the face, improving the cosmetic appearance.