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2. Astigmatism - Wikipedia

   en.wikipedia.org/wiki/Astigmatism

   Astigmatism; Blur from astigmatic lens at different distances: Specialty: Ophthalmology, optometry: Symptoms: Distorted or blurred vision at all distances, eyestrain, and headaches [1] Complications: Amblyopia [2] Causes: Unclear [3] Diagnostic method: Eye exam [1] Treatment: Glasses, contact lenses, surgery [1] Frequency: 30% to 60% of adults ...

3. Jackson cross cylinder - Wikipedia

   en.wikipedia.org/wiki/Jackson_cross_cylinder

   The Jackson cross cylinder (JCC) is an instrument used by ophthalmologists, orthoptists and optometrists in their routine eye examination, particularly in determination of corrective lens power in patients with astigmatism. It is also used for testing near point of the eye.

4. Visibly - Wikipedia

   en.wikipedia.org/wiki/Visibly

   In August 2022, Visibly received the FDA 510(k) clearance for its mobile-based vision test [9] preferably to provide prescription renewals to people between 22 and 40. [2] Visibly became the first FDA-cleared online vision test in the United States. [10] In January 2024, Visibly merged with EyecareLive and launched real-time video consultations ...

5. 10 Great Sites to Buy Cheap Eyeglasses Online - AOL

   www.aol.com/10-great-sites-buy-cheap-140036394.html

   Eyecare in general has become a lot more affordable in recent years. There’s even a website offering online eye exams that take 10 minutes or less and only cost $20.

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. Refractive error - Wikipedia

   en.wikipedia.org/wiki/Refractive_error

   A distant object is defined as an object located beyond 6 meters (20 feet) from the eye. [citation needed] When an object is located close to the eye, the rays of light from this object no longer approach the eye parallel to each other. Consequently, the eye must increase its refractive power to bring those rays of light together on the retina.