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2. Astigmatism (optical systems) - Wikipedia

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

   Astigmatism (optical systems) An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci. If an optical system with astigmatism is used to form an image of a cross, the vertical and horizontal lines will be in sharp focus at two different distances. The term comes from the Greek α- ( a ...

3. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   Corrective lens. A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye.

4. Laser blended vision - Wikipedia

   en.wikipedia.org/wiki/Laser_blended_vision

   Laser blended vision is a laser eye treatment which is used to treat presbyopia (ageing eyes; [1] progressive loss of the ability to focus on nearby objects) or other age-related eye conditions. [1] It can be used to help people that simply need reading glasses, and also those who have started to need bifocal or varifocal spectacle correction ...

5. Best and worst places to buy your next pair of glasses - AOL

   www.aol.com/news/2010-11-02-best-worst-places-to...

   Eyeglasses display Choose designer frames, ultra-thin lenses, progressive lenses and lens coatings and it's easy to drop over $400 for the pair. Bad service and poor quality would make the ...

6. These Stylish, Doctor-Approved Reading Glasses Can Help ... - AOL

   www.aol.com/best-doctor-approved-reading-glasses...

   Reading Glasses (5 Pairs) Reading glasses don’t need to cost an arm and a leg, Dr. Raviv says. For just over $15, you can get five pairs of these beloved readers—which means they clock in at ...

7. Optics and vision - Wikipedia

   en.wikipedia.org/wiki/Optics_and_vision

   Optics and vision. Vision of humans and other organisms depends on several organs such as the lens of the eye, and any vision correcting devices, which use optics to focus the image. The eyes of many animals contains a lens that focuses the light of its surroundings onto the retina of the eye. This lens is essential to producing clear images ...