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1-800 Contacts Inc. is an American contact lens retailer based in Draper, Utah. The brands that 1-800 Contacts use includes Johnson & Johnson Vision Care, Alcon, Bausch & Lomb and CooperVision. The company was founded as the industry's first way to buy contacts online and has since expanded to provide online prescription renewals, glasses, lens ...
A prescription of −1.00 +0.25 × 180 describes a lens that has a horizontal power of −1.00 D and a vertical power of −0.75 D. Only ophthalmologists write prescriptions in + cylinder. An optometrist would write a prescription in - (minus) cylinder. All spectacle and contact lenses would be made in minus cylinder.
In the US market, soft contact lenses are approved by the US Food and Drug Administration. [2] The American Optometric Association published a contact lens comparison chart called Advantages and Disadvantages of Various Types of Contact Lenses on the differences between them. [3] These include: soft contact lenses; rigid gas-permeable (RGP ...
Its lower refractive index of n d = 1.532 vs. polycarbonate's 1.586 may result in slightly thicker lenses depending upon the prescription. Along with polycarbonate and the various high-index plastics, Trivex is a lab favorite for use in rimless frames, owing to the ease with which it can be drilled and its resistance to cracking around the ...
Vertex distance is the distance between the back surface of a corrective lens, i.e. glasses (spectacles) or contact lenses, and the front of the cornea. Increasing or decreasing the vertex distance changes the optical properties of the system, by moving the focal point forward or backward, effectively changing the power of the lens relative to ...
At that time, Lens Express had sold over 100 million contact lenses to over two million consumers. [13] December 16, 2002, 1-800 CONTACTS, Inc. signed a letter of intent with Southfield, Michigan-based Camelot Ventures to acquire select assets of Lens Express and Lens 1st, the two leading U.S. mail-order contact lens retailers.
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