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An eye chart is a chart used to measure visual acuity comprising lines of optotypes in ranges of sizes. Optotypes are the letters or symbols shown on an eye chart. [1] Eye charts are often used by health care professionals, such as optometrists, physicians and nurses, to screen persons for vision impairment. Ophthalmologists, physicians who specialize in the eye, also use eye charts to monitor ...
A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula developed by his professor Franciscus Cornelius Donders. [1] [2] Many ophthalmologists and vision scientists now use an improved chart known as the LogMAR chart .
List of pharmaceutical companies This listing is limited to those independent companies and subsidiaries notable enough to have their own articles in Wikipedia. Both going concerns and defunct firms are included, as well as firms that were part of the pharmaceutical industry at some time in their existence, provided they were engaged in the production of human (as opposed to veterinary ...
List of multi-level marketing companies This is a list of companies which use multi-level marketing (also known as network marketing, [1] [2] [3] [4] [5] direct selling, [3] [6] referral marketing, [7] and pyramid selling) [8] [9] [10] [11] [12] for most of their sales.
List of airlines of the United States This is a list of airlines which have an air operator's certificate issued by the Federal Aviation Administration of the United States.
The Philippines is a sovereign island country in Southeast Asia situated in the western Pacific Ocean. It is a founding member of the United Nations, World Trade Organization, Association of Southeast Asian Nations, the Asia-Pacific Economic Cooperation forum, and the East Asia Summit. It also hosts the headquarters of the Asian Development Bank. [1] The Philippines is considered to be an ...
Optometry is the healthcare profession focused on eye care, vision testing, and prescribing corrective lenses.
The Fortune 500 list of companies includes only publicly traded companies, also including tax inversion companies. There are also corporations having foundation in the United States, such as corporate headquarters, operational headquarters and independent subsidiaries. The list excludes large privately held companies such as Cargill and Koch Industries whose financial data is not necessarily ...