What are the different types of refractive errors?

Various. Myopia (near sightedness) and hyperopia (far sightedness) are the two main categories. Astigmatism is different curvature of the eye in one axis and can occur with both myopia and hyperopia.
Blurring of vision. The most common causes of 'blurred' vision are refractive errors; of which there hyperopia, myopia, astigmatism, and presbyopia.