LENSES WITH SUCCESSIVE ADDITION

FIELD: ophthalmology, multifocal lenses. SUBSTANCE: invention is aimed at design of such lenses with successive addition in which undesirable astigmatism diminishes and width of channel between intermediate zone and vision zone at close distance increases. This result is achieved as lens carrying op...

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Bibliographische Detailangaben
Hauptverfasser:	CHIPMAN RASSELL A, BLJUM RONAL'D D, GUPTA AMITAVA, MENEZES EHDGAR VTKHAL
Format:	Patent
Sprache:	eng ; rus
Schlagworte:	BANDAGES, DRESSINGS OR ABSORBENT PADS CONTACT LENSES DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS FILTERS IMPLANTABLE INTO BLOOD VESSELS FIRST-AID KITS FOMENTATION HUMAN NECESSITIES HYGIENE MEDICAL OR VETERINARY SCIENCE OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES PHYSICS PROSTHESES SPECTACLES SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES TREATMENT OR PROTECTION OF EYES OR EARS
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Beschreibung
Zusammenfassung:	FIELD: ophthalmology, multifocal lenses. SUBSTANCE: invention is aimed at design of such lenses with successive addition in which undesirable astigmatism diminishes and width of channel between intermediate zone and vision zone at close distance increases. This result is achieved as lens carrying optical work stock, which has surface with successive addition, vision zone at close distance and first added focal power also includes one or more continuous optical elements with second added focal power. At least one continuous optical element is so positioned that it overlaps vision zone at close distance. In this case added focal power of lens is sum of first and second added focal powers. Invention describes variants combining surfaces with successive addition. EFFECT: expanded functional potential of lenses. 23 cl, 10 dwg