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mon eye conditions that can cause significant vision impairment if left untreated. Although the types of vision problems myopia and hyperopia cause are different, they are similar conditions in that they are both refractive errors that exist because of irregularities in the physical shape and size of the eye. A refractive error affects your vision due to the way it acts on light. The lens of your eye is there to refract (focus) light onto the retina, and irregularities in the shape or size of th