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  • Are high quality prescription lenses cheaper in China or ...

    definitely cheaper in china, yes the glass/polycarbonate would be the same price for the same level of quality in china or elsewhere, but the labor to cut the lenses to shape and to install them is so low it barely affects the price.

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    Nov 01, 2002· bicentric grinding If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed.

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    Traditionally a progressive (varifocal) lens is made by grinding and polishing the back surface of a thick 'uncut' lens. These are made with range of standard pre-cast progressive/varifocal front surfaces and the nearest ideal design is selected for your prescription.

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    The lenses will be more tailored to that one prescription, but you will not get the benefit of multi-focal lenses. The good things is that there are multi-focal digital lenses that can significantly improve your vision at all distances compared to other lenses.

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    Single Vision Grind Lenses Like single vision stock, grind lenses have one focal length over the entire lens. However they are custom made for the patient's prescription, making them suitable for people with higher prescriptions.

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  • How To Choose The Best Lenses For Your Glasses

    The following information applies to all prescription lenses for glasses — whether you need single vision lenses to correct nearsightedness, farsightedness, and/or astigmatism, or you need progressive lenses, bifocals or other multifocal lenses to also correct presbyopia.

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  • Glazing spectacle lenses | Lawrence and Harris Opticians

    The lens shape is firstly measured mechanically or optically so that the computer controlled lens grinding machine has a an accurate image of the lens before cutting begins. The lens is placed within the machine where the prescription is again checked for accuracy.

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    Browse our eyeglass lens options and select your lenses! ReplaceALens fits new eyeglass lenses to your frame, making online eyeglass lens replacement safe and easy, guaranteed! Best lens pricing and cost on Progressives, transitions, Crizal, and more, for less.

  • Toric Lenses.1 (WP) - Dr. Dr. Bill

    The prescription for a toric lens is written as if it were a superposition of a spherical lens (which has the same prescription in all meridians) and a cylinder lens (which has power in only one meridian). For example-5.00/-2.00x175

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    Non Prescription Polycarbonate Lenses The Polycarbonate (1.59 index) lens material is a great choice for mid-range prescriptions. Polycarbonate lenses are thinner and lighter than standard plastic, have increased impact resistance and UV protection.

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  • How to Read Your Glasses & Contact Lens Prescriptions ...

    Glasses and contact lens prescriptions are often slightly different — a contact lens prescription would include the brand name and the Diameter measurement. I would recommend contacting your eye care professional for a copy of your contact lens prescription.

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    May 19, 2018· How to Read a Contact Lens Prescription In this Article: Reading a Typical Lens Prescription Reading a More Involved Lens Prescription Community Q&A After visiting an eye doctor to correct your vision, you will receive a piece of paper indicating your contact lens prescription.

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    Eyeglass lenses are glass or plastic optical items that fit inside eyewear frames to enhance and/or correct the wearer's vision. The magnifying glass, invented in the early 1200s, was the first optical lens used for enhancing vision.

  • How to Read Your Eyeglass Prescription | LensCrafters

    SPH(or Sphere) indicates the eyeglass prescription power, or how strong your lenses need to be to correct your vision.For an indicator of how much magnifying power is needed in a bifocal or progressive lens to correct your vision problems, look for ADD. CYL (or Cylinder) indicates astigmatism, a condition where the cornea is irregularly shaped causing blurred or distorted vision.