What is myopia? What is its remedy?

In myopia

What is myopia? What are its causes? Name the type of the lens to correct this defect.

What happens when an ant stings ? What is its remedy?

(a). What happens during a bee sting? What is its remedy? (b). What happens during a wasp sting? What is its remedy?

What is myopia?What are its causes ?Name the type of the lens to correct this defect.