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    Our pick for a flat-top bifocal Read More Crystal Vision plastic CR39 lenses for bifocal vision distance viewing means that the reading area has a half moon shape with a 'flat top', in the bottow area of the lens. The standard CR39, flat top 28 bifocal has a reading area that is 28mm wide at the top.

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  • Aspheric Eyeglass Lenses - AllAboutVision.com

    2 天前 · Aspheric lenses have a slimmer profile for virtually all prescriptions, but the difference is especially dramatic in lenses that correct high amounts of farsightedness.Lenses that correct farsightedness (convex or 'plus' lenses) are thicker in the center and thinner at their edge.

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  • Electro-active opthalmic lens having an optical power ...

    A spectacle lens is disclosed. The disclosed lens provides a vision correcting area for the correction of a wearer's refractive error. The viewing correction area ...

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  • Corrective lens - WikiMili, The Free Encyclopedia

    2019-12-11 · Optical crown glass (B270 - Soda/lime glass)Refractive index (n d): 1.52288; Abbe value (V d): 58.5; Density: 2.56 g/cm 3 (the heaviest corrective lens material in common use, today); UV cutoff: 320 nm; Glass lenses have become less common owing to the danger of shattering and their relatively high weight compared to CR-39 plastic lenses. They still remain in use for specialised circumstances ...

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  • Electro-active opthalmic lens having an optical power ...

    A spectacle lens is disclosed. The disclosed lens provides a vision correcting area for the correction of a wearer's refractive error. The viewing correction area ...

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    2010-1-1 · The Alvarez lens has been applied to Humphrey analyzer (Humphrey, 1976), scanning microscope (Rege, Tkaczyk & Descour, 2004), intraocular accommodative lens (Simonov, Vdovin, & Rombach, 2006), and spectacle lenses (Spivey, 2008).Recent analysis (Barbero, 2009) shows that for the same power and lateral shifts, the Lohmann lens is thinner and provides better optical performance.

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  • Adaptive Lens - ScienceDirect

    2010-1-1 · The Alvarez lens has been applied to Humphrey analyzer (Humphrey, 1976), scanning microscope (Rege, Tkaczyk & Descour, 2004), intraocular accommodative lens (Simonov, Vdovin, & Rombach, 2006), and spectacle lenses (Spivey, 2008).Recent analysis (Barbero, 2009) shows that for the same power and lateral shifts, the Lohmann lens is thinner and provides better optical performance.

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    Ophthalmic lens design and manufacture is changing because of the use of aspherics to correct presbyopia and because of the use of thermoplastic and thermosetting materials. These combinations are examined and compared to the aspheric component prospects in the mainstream of optics. Thermal replication of aspheric surfaces is described in relationship to injection molding and casting ...

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    A corrective lens is a lens worn in front of the eye, mainly used to treat myopia, hyperopia, astigmatism, and presbyopia. Glasses or 'spectacles' are worn on the face a short distance in front of the eye. Contact lenses are worn directly on the surface of the eye. Intraocular lenses are surgically implanted most commonly after cataract removal, but recently for purely refractive purposes.

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    when the surfaces of a 1.530 index glass lens are measured with a lens clock, the front curve reads +6.00 D and the back curve reads -5.50 D. the focal length of that lens is: -2.50 +2.50 x 180 the power of a compound lens in any given meridian will vary as the axis of the cylinder changes. which of the following lenses contain no power in the ...

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