One can buy these lenses on many websites and stores. Walmart and Target have a huge selection of these types of lenses to choose from. Many people buy these lenses each day.
There are many online option available for contact lenses. I order my lenses from http://secondsightonline.co.uk/
The number is unknown. But there are hundreds of lenses in there eye.
There are many different lenses for cameras; Wide angle lenses, standard lenses, portrait lenses, telephoto lenses and more. Canon has its own brand of lenses but also Sigma y Tamron are offering compatible lenses for it, it just depends on the price and the quality you are looking for
1:Single Vision Lenses 2:Multi focal Lenses 3:Bifocal Lenses 4:Progressive lenses Source Vision Express India
Microscopes use different amounts of lenses depending on the microscope.
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The difference between bifocal and multifocal contact lenses is that biofocal contact lenses do not provide so many different angles as multifocal contact lenses do. Biofocal contact lenses do not allow the user to see as good as with multifocal contact lenses.
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One can buy these types of lenses at almost any department stores. Target and Walmart are a couple of the many places that sell these types of lenses in their stores.