refraktiivisiin

Refraktiivisiin refers to refractive errors, which are common vision conditions where the eye does not focus light correctly on the retina. This causes blurred vision. The most common types of refractive errors include myopia (nearsightedness), hyperopia (farsightedness), astigmatism, and presbyopia.

Myopia occurs when the eyeball is too long or the cornea is too curved, causing distant objects to appear blurry. Hyperopia happens when the eyeball is too short or the cornea is too flat, making close objects appear blurry. Astigmatism is caused by an irregular shape of the cornea or lens, leading to distorted vision at all distances. Presbyopia is an age-related condition where the lens of the eye loses its flexibility, making it difficult to focus on near objects.

Refractive errors are typically diagnosed through a comprehensive eye examination by an optometrist or ophthalmologist. They can be corrected using eyeglasses, contact lenses, or refractive surgery such as LASIK or PRK. The goal of correction is to redirect light so it focuses properly on the retina, thereby improving visual clarity. Understanding refraktiivisiin is important for maintaining good eye health and ensuring clear vision.