refraktif

Refraktif is a term used in physics and medicine to describe phenomena or properties related to refraction, the change in direction of a wave such as light or sound as it passes from one medium to another. In optics, a refraktif material is characterized by its ability to bend light rays. This capability is determined by the refractive index, a dimensionless number that describes how light propagates through the medium. Materials with a higher refractive index bend light to a greater degree than those with a lower index.

In the medical field, specifically ophthalmology, the term pertains to the focusing power of the eye. A refractive error occurs when the eye's shape prevents light from focusing directly on the retina, resulting in blurred vision. Common types of refractive errors include myopia (nearsightedness), hyperopia (farsightedness), astigmatism, and presbyopia. These conditions are typically diagnosed through a refraction test and are corrected using visual aids such as eyeglasses or contact lenses. Advanced treatments may also involve refractive surgery, like LASIK, which reshapes the cornea to improve visual acuity. The term functions as an adjective in several languages, including Indonesian and Malay, distinguishing objects or conditions associated with optical deflection.