Here are four categories of vision correction: Emmetropia: Emmetropia is perfect vision. This term defines eyes that see perfectly and eyes that refracting the light onto the retina correctly without requiring any correction. Myopia: Myopia is also known as near-sighted vision and it develops when the eye has difficulties or blurriness in seeing objects in the distance. To correct Myopia, your optometrist needs to prescribe minus lenses to push the point of focus backwards to align the light onto the retina. Myopia is the most commonly seen eye disease within patients. Hyperopia: Hyperopia is the complete opposite of Myopia in which the eyes have difficulties or blurriness in seeing near objects and see the distance clearly. Even though Hyperopia is not as common as Myopia, it is also frequently present. Astigmatism: Astigmatism is an eye health condition that develops slowly and occurs when the retina and the lens don't curve equally. As a result, light doesn’t bend properly on the retina.