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2. Snellen chart - Wikipedia

   en.wikipedia.org/wiki/Snellen_chart

   Snellen chart. Purpose. Snellen chart is used to estimate visual acuity (last three rows are 20/15, 20/13 and 20/10) 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 ...

3. Eye chart - Wikipedia

   en.wikipedia.org/wiki/Eye_chart

   Landolt C. Lea test. logMAR chart. 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.

4. List of presidents of the United States - Wikipedia

   en.wikipedia.org/wiki/List_of_presidents_of_the...

   Since the office was established in 1789, 45 men have served in 46 presidencies. The first president, George Washington, won a unanimous vote of the Electoral College. [ 4] Grover Cleveland served two non-consecutive terms and is therefore counted as the 22nd and 24th president of the United States, giving rise to the discrepancy between the ...

5. Jaeger chart - Wikipedia

   en.wikipedia.org/wiki/Jaeger_chart

   The Jaeger chart is an eye chart used in testing near visual acuity. It is a card on which paragraphs of text are printed, with the text sizes increasing from 0.37 mm to 2.5 mm. [ 1] This card is to be held by a patient at a fixed distance from the eye dependent on the J size being read. The smallest print that the patient can read determines ...

6. Table of nuclides - Wikipedia

   en.wikipedia.org/wiki/Table_of_nuclides

   A table or chart of nuclides is a two-dimensional graph of isotopes of the elements, in which one axis represents the number of neutrons (symbol N) and the other represents the number of protons (atomic number, symbol Z) in the atomic nucleus. Each point plotted on the graph thus represents a nuclide of a known or hypothetical chemical element.

7. International Phonetic Alphabet chart for English dialects

   en.wikipedia.org/wiki/International_Phonetic...

   The International Phonetic Alphabet chart for English dialects complies all the most common applications of the International Phonetic Alphabet (IPA) to represent pronunciations of the English language . These charts give a diaphoneme for each sound, followed by its realization in different dialects. The symbols for the diaphonemes are given in ...