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2. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   Aspherics are only [citation needed] used for corrective lenses when, in order to achieve a flatter lens for cosmetic reasons, the lens design deviates from the best-form sphere; this results in degradation of the visual correction, degradation which can, in some part, be compensated for by an aspheric design. The same is true for atoric and bi ...

3. Refractive surgery - Wikipedia

   en.wikipedia.org/wiki/Refractive_surgery

   Refractive surgery is an optional eye surgery used to improve the refractive state of the eye and decrease or eliminate dependency on glasses or contact lenses. This can include various methods of surgical remodeling of the cornea (keratomileusis), lens implantation or lens replacement.

4. Orthokeratology - Wikipedia

   en.wikipedia.org/wiki/Orthokeratology

   Orthokeratology lens. Orthokeratology, also referred to as Night lenses, Ortho-K, OK, Overnight Vision Correction, Corneal Refractive Therapy (CRT), Accelerated Orthokeretology, Cornea Corrective Contacts, Eccentricity Zero Molding, and Gentle Vision Shaping System (GVSS), is the use of gas-permeable contact lenses that temporarily reshape the cornea to reduce refractive errors such as myopia ...

5. Better Business Bureau (BBB) complaints and accreditation ...

   www.aol.com/lifestyle/better-business-bureau-bbb...

   With a legacy of more than 100 years, the Better Business Bureau (BBB) is the go-to watchdog for evaluating businesses and charities. The nonprofit organization maintains a massive database of ...

6. Astigmatism (optical systems) - Wikipedia

   en.wikipedia.org/wiki/Astigmatism_(optical_systems)

   Astigmatism causes difficulties in seeing fine detail. Astigmatism can be often corrected by glasses with a lens that has different radii of curvature in different planes (a cylindrical lens), contact lenses, or refractive surgery. [5] Astigmatism is quite common. Studies have shown that about one in three people suffers from it.

7. Astigmatism - Wikipedia

   en.wikipedia.org/wiki/Astigmatism

   Three treatment options are available: glasses, contact lenses, and surgery. [1] Glasses are the simplest. [1] Contact lenses can provide a wider field of vision and fewer artifacts than even double aspheric lenses. [1] Refractive surgery aims to permanently change the shape of the eye and thereby cure astigmatism. [1]