Refractive errors are common vision problems that occur when the shape of the eye prevents light from properly focusing onto the retina, leading to blurred vision. There are four main types of refractive errors: myopia (nearsightedness), hyperopia (farsightedness), astigmatism (irregular corneal curvature), and presbyopia (age-related loss of near vision). Myopia causes distant objects to appear blurry, while hyperopia makes close-up objects blurry. Astigmatism causes overall blurred vision at all distances, and presbyopia affects near vision, particularly in those over 40 years old. Refractive errors can be corrected with eyeglasses, contact lenses, or refractive surgery such as LASIK. Regular eye examinations and appropriate correction can help manage refractive errors and maintain clear vision.