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2. Pupillary distance - Wikipedia

   en.wikipedia.org/wiki/Pupillary_distance

   Distance PD is the separation between the visual axes of the eyes in their primary position, as the subject fixates on an infinitely distant object. [2] Near PD is the separation between the visual axes of the eyes, at the plane of the spectacle lenses, as the subject fixates on a near object at the intended working distance. [3]

3. Eye examination - Wikipedia

   en.wikipedia.org/wiki/Eye_examination

   Using a phoropter to determine a prescription for eyeglasses. Retinal vessel analysis is a non-invasive method to examine the small arteries and veins in the retina which allows to draw conclusions about the morphology and the function of small vessels elsewhere in the human body and is used in particular by cardiologists as well as ...

4. Progressive lens - Wikipedia

   en.wikipedia.org/wiki/Progressive_lens

   In general the older the patient, the higher the addition. They are also known as multifocal lenses, progressive addition lenses (PAL), varifocal lenses, progressive power lenses, graduated prescription lenses, or progressive spectacle lenses.

5. Zenni Optical - Wikipedia

   en.wikipedia.org/wiki/Zenni_Optical

   Zenni Optical mail order. Zenni Optical was founded in 2003 by Tibor Laczay and Julia Zhen. [1] [2] Before being renamed to Zenni Optical when it began offering $7 and $8 glasses, the company was named 19dollareyeglasses.com. [3] [4] [5] Around 2014, co-founder Zhen acquired the building occupied by the Marin Independent Journal to house Zenni. [6]

6. List of countries with universal health care - Wikipedia

   en.wikipedia.org/wiki/List_of_countries_with...

   Algeria operates a public healthcare system. It is a universal healthcare system as well. A network of hospitals, clinics, and dispensaries provide treatment to the population, with the Social Security system funding health services, although many people must still cover part of their costs due to the rates paid by the Social Security system remaining unchanged since 1987.

7. Medication costs - Wikipedia

   en.wikipedia.org/wiki/Medication_costs

   Medication costs can be the selling price from the manufacturer, that price together with shipping, the wholesale price, the retail price, and the dispensed price. The dispensed price or prescription cost is defined as a cost which the patient has to pay to get medicines or treatments which are written as directions on prescription by a prescribers.