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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. Visual acuity - Wikipedia

   en.wikipedia.org/wiki/Visual_acuity

   For 6/6 = 1.0 acuity, the size of a letter on the Snellen chart or Landolt C chart is a visual angle of 5 arc minutes (1 arc min = 1/60 of a degree), which is a 43 point font at 20 feet. [10] By the design of a typical optotype (like a Snellen E or a Landolt C), the critical gap that needs to be resolved is 1/5 this value, i.e., 1 arc min.

4. Coach Outlet's massive summer sale is here: Get 70% off new ...

   www.aol.com/lifestyle/coach-outlets-massive...

   Now through July 30 you can get an extra 20% off your purchase at Coach Outlet when you buy two or more leather goods. That's right: Stock up on, say, a leather bag and matching wallet, and you'll ...

5. List of Unicode characters - Wikipedia

   en.wikipedia.org/wiki/List_of_Unicode_characters

   1 Control-C has typically been used as a "break" or "interrupt" key. 2 Control-D has been used to signal "end of file" for text typed in at the terminal on Unix / Linux systems. Windows, DOS, and older minicomputers used Control-Z for this purpose. 3 Control-G is an artifact of the days when teletypes were in use.

6. The best sales this weekend to know about: Vacuums, Coach ...

   www.aol.com/lifestyle/the-15-best-sales-this...

   Right now Coach Outlet is running an extra 15% off already-on-sale styles like this tote purse that's perfect for work. It's also a good time to save during Macy's summer sale, like this retro ...

7. 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.