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2. List of soft contact lens materials - Wikipedia

   en.wikipedia.org/wiki/List_of_soft_contact_lens...

   Acuvue Oasys, Acuvue Oasys for Astigmatism, Acuvue Oasys for Presbyopia, Acuvue Oasys 1-Day, Acuvue Oasys 1-Day for Astigmatism, Acuvue Oasys with Transitions, Acuvue Oasys Max 1-Day, Acuvue Oasys Max 1-Day Multifocal Senofilcon C: 41: 129-147: 0.77: 0.07: Acuvue Vita, Acuvue Vita for Astigmatism Sifilcon A: 1: 32: 82: 0.08: O 2 Optix Custom ...

3. Acuvue - Wikipedia

   en.wikipedia.org/wiki/Acuvue

   Daily Disposable: 1-Day Acuvue Moist – (etafilcon A) hydrogel material (available for astigmatism and presbyopia).Introduced in 2006. 1-Day Acuvue TruEye – (narafilcon A) first silicone hydrogel daily disposable [4] released 2008 in European Markets and 2010 in North America.

4. List of Billboard Hot 100 number-one singles of the 1980s

   en.wikipedia.org/wiki/List_of_Billboard_Hot_100...

   Whitney Houston scored seven consecutive number-one singles during the 1980s, becoming the only artist in the chart's history to achieve this feat. During the 1980s, George Michael scored four number-one singles as a solo artist, three with Wham! and one as a duet with Aretha Franklin. Olivia Newton-John 's "Physical" remained the longest at ...

5. Lists of Billboard number-one singles - Wikipedia

   en.wikipedia.org/wiki/Lists_of_Billboard_number...

   This is a list of songs that have peaked at number one on the Billboard Hot 100 and the magazine's national singles charts that preceded it. Introduced in 1958, the Hot 100 is the pre-eminent singles chart in the United States, currently monitoring the most popular singles in terms of popular radio play, single purchases and online streaming.

6. 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 ...

7. 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.