These images then are transmitted through the eye’s optic nerve to the brain for interpretation. The retina is the tissue that lines the inside of the back of the eye, where light-sensitive cells ( photoreceptors) capture images in much the same way that film in a camera does when exposed to light. The process of vision begins when light rays that reflect off objects and travel through the eye’s optical system are refracted and focused into a point of sharp focus.įor good vision, this focus point must be on the retina. Even the tear film on the surface of the eye and the fluids inside the eye ( aqueous humor and vitreous) have some degree of refractive ability. The eye’s natural lens also bends light rays. ![]() Most refraction in the eye occurs when light rays travel through the curved, clear front surface of the eye ( cornea). Certain eye structures have refractive properties similar to water or lenses and can bend light rays into a precise point of focus essential for sharp vision. When light travels through water or a lens, for example, its path is bent or refracted. While we don’t fully understand all the different properties of light, we do have an idea of how light travels.Ī light ray can be deflected, reflected, bent or absorbed, depending on the different substances it encounters. SEE RELATED: What is ametropia? How light travels through the eye Refractive errors usually can be “corrected” with eyeglasses or contact lenses, or they can be permanently treated with LASIK and other vision correction surgery (also called refractive surgery). The primary refractive errors are nearsightedness, farsightedness and astigmatism. Refractive errors are optical imperfections that prevent the eye from properly focusing light, causing blurred vision. We see the world around us because of the way our eyes bend (refract) light. Schedule an exam Find Eye Doctor What is a refractive error?īlurry vision - usually caused by refractive errors - is the main reason a person seeks the services of an eye doctor.īut what does it really mean when we’re told that our vision is blurry because we have a refractive error?
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