It is Sulphonation of Copper. It is generally available in 5H2O (Crystal) form, though anhydrous is also available. Copper sulphate, blue stone, blue vitriol are all common names for pentahydrated cupric sulphate, which is the best known and the most widely used of the copper salts.t is Sulphonation of Copper. It is generally available in 5H2O (Crystal) form, though anhydrous is also available. Copper sulphate, blue stone, blue vitriol are all common names for pentahydrated cupric sulphate, which is the best known and the most widely used of the copper salts.
Disposable soft lenses. Contact lenses were first recognized in 1945 by the American Optometric Association. Over 38 million people wear contacts in the United States alone with international numbers topping 125 million. As more and more people receive proper eye care, the use of contact lenses continues to grow.
A new kind of contact lens is now available for people with astigmatism, called toric contacts. Typically anyone with astigmatism can now use soft contacts, even disposable ones, even if they have astigmatism.ontact Lenses Now Available For Astigmatism. The last time I was at the eye doctor my ophthalmologist confirmed I have an astigmatism. In the past I always assumed this meant I couldn't wear contact lenses. At least, that is what I was told many years ago.