Patent classifications
G
PHYSICS
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G02
OPTICS
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G02C
SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
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G02C7/02
Lenses; Lens systems; ; Methods of designing lenses
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G02C7/06
bifocal; multifocal; ; progressive
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G02C7/061
Spectacle lenses with progressively varying focal power
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G02C7/063
Shape of the progressive surface
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G02C7/065
Properties on the principal line
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