INTRAOCULAR LENS

A first region (R1) is a circular region located at the centermost position. A first refractive power is uniformly added to the first region (R1) regardless of the distance from an axis (O) of a lens part (2). A second region (R2) is a ring-like region located adjacent to the first region (R1) at an...

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Bibliographische Detailangaben
Hauptverfasser:	OHTA, Hiroshi, MONOBE, Tomoya
Format:	Patent
Sprache:	eng ; fre ; ger
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 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:	A first region (R1) is a circular region located at the centermost position. A first refractive power is uniformly added to the first region (R1) regardless of the distance from an axis (O) of a lens part (2). A second region (R2) is a ring-like region located adjacent to the first region (R1) at an outer side of the first region (R1). In the second region (R2), a refractive power is increased or decreased from the first refractive power as the distance from the axis (O) becomes larger. An outer region (RO) is a ring-like region located at an outer side of the second region (R2). A reference refractive power for focusing on a far point is added to the outer region (RO). An MTF curve at spatial frequency of 50 lp/mm relating to light passing through a region having a radius of 1.5 mm around the axis (O) of the lens part (2) has one maximal value and no minimal value in a range of a defocusing value of -0.5 D to 0.5 D.