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2. Astigmatism - Wikipedia

   en.wikipedia.org/wiki/Astigmatism

   Although astigmatism may be asymptomatic, higher degrees of astigmatism may cause symptoms such as blurred vision, double vision, squinting, eye strain, fatigue, or headaches. [7] Some research has pointed to the link between astigmatism and higher prevalence of migraine headaches.

3. 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.

4. List of optometric abbreviations - Wikipedia

   en.wikipedia.org/wiki/List_of_optometric...

   Visual acuity with eye chart at Near 15.7 inches (400 mm) and without (sc: Latin sine correctore) correctors (spectacles); Ncc is with (cc: Latin cum correctore) correctors. See Visual_acuity#Legal_definitions: VA OS Left visual acuity VA OD Right visual acuity VDU Visual display unit VF Visual field VPS Variable prism stereoscope WD

5. Why astigmatism causes blurry vision, especially at night - AOL

   www.aol.com/news/why-astigmatism-causes-blurry...

   Astigmatism, a disorder that affects how the eyes focus light, can be exacerbated at night. Blurry vision and headaches are symptoms of astigmatism. Why astigmatism causes blurry vision ...

6. Human eye - Wikipedia

   en.wikipedia.org/wiki/Human_eye

   The human eye is a sensory organ in the visual system that reacts to visible light allowing eyesight. ... (far-sightedness), astigmatism, and presbyopia ...

7. “7 Little Johnstons”' Trent Learns for 'Very First Time ...

   www.aol.com/lifestyle/7-little-johnstons-trent...

   After receiving some scary results from an MRI last week, Trent Johnston continues to undergo medical tests and meets with an eye doctor in the new episode of TLC’s 7 Little Johnstons.. In a ...