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2. Eyeglass prescription - Wikipedia

   en.wikipedia.org/wiki/Eyeglass_prescription

   Eyeglass prescription. Using a phoropter to determine a prescription for eyeglasses. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.

3. Astigmatism (optical systems) - Wikipedia

   en.wikipedia.org/wiki/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-) meaning "without" and ...

4. Astigmatism - Wikipedia

   en.wikipedia.org/wiki/Astigmatism

   Astigmatism may be corrected with eyeglasses, contact lenses, or refractive surgery. [1] Glasses are the simplest and safest, although contact lenses can provide a wider field of vision . Refractive surgery can eliminate the need to wear corrective lenses altogether by permanently changing the shape of the eye but, like all elective surgery ...

5. Visual snow syndrome - Wikipedia

   en.wikipedia.org/wiki/Visual_snow_syndrome

   Uncommon (understudied) Visual snow syndrome ( VSS) is an uncommon neurological condition in which the primary symptom is that affected individuals see persistent flickering white, black, transparent, or colored dots across the whole visual field. [ 7][ 4] Other common symptoms are palinopsia, enhanced entoptic phenomena, photophobia, and ...

6. Medicare costs significantly lowered on popular prescription ...

   www.aol.com/finance/medicare-costs-significantly...

   Right now, Americans pay two to three times more for prescription drugs than they would anywhere else. But the Biden-Harris Administration beat Big Pharma. And after months of negotiations ...

7. FTC orders 8 companies to provide information on ... - AOL

   www.aol.com/news/ftc-orders-8-companies...

   July 23, 2024 at 6:15 PM. NEW YORK (AP) — The Federal Trade Commission has ordered information from eight companies that the agency says offer products and services that use personal data to set ...