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2. Refractive error - Wikipedia

   en.wikipedia.org/wiki/Refractive_error

   One style is hard contact lenses, which can distort the shape of the cornea to a desired shape. Another style, soft contact lenses, are made of silicone or hydrogel. Depending on the duration they are designed for, they may be worn daily or may be worn for an extended period of time, such as for weeks. [32] There are a number of complication ...

3. Strabismus - Wikipedia

   en.wikipedia.org/wiki/Strabismus

   In cases of accommodative esotropia, the eyes turn inward due to the effort of focusing far-sighted eyes, and the treatment of this type of strabismus necessarily involves refractive correction, which is usually done via corrective glasses or contact lenses, and in these cases surgical alignment is considered only if such correction does not ...

4. Wal-Mart: The High Cost of Low Price - Wikipedia

   en.wikipedia.org/wiki/Wal-Mart:_The_High_Cost_of...

   Wal-Mart: The High Cost of Low Price is a 2005 documentary film by director Robert Greenwald and Brave New Films about the American multinational corporation and retail conglomerate Walmart. [2] The film presents a negative picture of Walmart's business practices through interviews with former employees, small business owners, and footage of ...

5. Gravitational lens - Wikipedia

   en.wikipedia.org/wiki/Gravitational_lens

   Gravitational lenses act equally on all kinds of electromagnetic radiation, not just visible light, and also in non-electromagnetic radiation, like gravitational waves. Weak lensing effects are being studied for the cosmic microwave background as well as galaxy surveys. Strong lenses have been observed in radio and x-ray regimes as well. If a ...

6. Myopia - Wikipedia

   en.wikipedia.org/wiki/Myopia

   Myopia can be corrected with eyeglasses, contact lenses, or by refractive surgery. [1] [16] Eyeglasses are the simplest and safest method of correction. [1] Contact lenses can provide a relatively wider corrected field of vision, but are associated with an increased risk of infection.

7. Corrective Optics Space Telescope Axial Replacement

   en.wikipedia.org/wiki/Corrective_Optics_Space...

   One potential option was to insert corrective optics, lenses or mirrors in the telescope tube between the primary mirror and the secondary reflector. However the tube was too narrow for even the smallest astronaut to slither down it, leading to a search for a means of inserting the required corrective components into the tube.