Toric Contact Lenses: A Consumer Guide. Toric contact lenses correct astigmatism They can be made from HEMA (soft), silicone hydrogel, or gas permeable materials. Unlike spherical lenses, toric lenses have two different powers in the lens. This characteristic means that the toric lens must remain in one position for the best visual acuity.
The Preamble to the US Constitution, the Pledge of Allegiance, and the Declaration of Independence. Unit Objective. This unit is part of Gilder Lehrmanâs series of Common Core State Standardsâbased teaching resources. These units were developed to enable students to understand, summarize, and analyze original texts of historical significance.
The United States Declaration of Independence is a statement adopted by the Continental Congress on July 4, 1776, which announced that the thirteen American colonies then at w â¦ ar with Great Britain were now independent states, and thus no longer a part of the British Empire.It is important to note that not all colonists wanted independence. There was still about 500,000 whigs that were loyal to the British crown. It can be argued that the Revolutionary War was precipitated by leaders in society such as Ben Franklin, George Washington, Samuel Adams, John Adams, and many more.