Double Vision Refractive Error
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Program Spanish-language Education Program (¡Ojo con su visión!) Vision and Aging Program Training and Jobs All Training and Jobs NEI Summer Intern Program Diversity In Vision Research & Ophthalmology (DIVRO) Student Training Programs NEI Home About NEI Health Information News and Events Grants and Funding Research at NEI Education Programs Training and Jobs Home > Eye Health Information > Refractive Errors > Facts refractive error hypermetropia About Refractive Errors Facts About Refractive Errors This information was developed by the National Eye Institute to help patients and their families search for general information about refractive errors. An eye care professional who has examined the patient’s eyes and is familiar with his or her medical history is the best person to answer specific questions. Refractive Errors Defined What are refractive errors? Refractive errors occur when the shape of the eye prevents light from focusing directly on the retina. The length of the eyeball (longer or shorter), changes in the shape of the cornea, or aging of the lens can cause refractive errors. What is refraction? Refraction is the bending of light as it passes through one object to another. Vision occurs when light rays are bent (refracted) as they pass through the cornea and the lens. The light is then focused on the retina. The retina converts the light-rays into messages that are sent through the optic nerve to the brain. The brain interprets these messages into the images we see. Frequently Asked Questions about Refractive Errors What are the different types of refractive errors? The most common types of refractive errors are myopia, hyperopia, presbyopia, and astigmatism. Myopia (nearsightedness) is a condition where
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often are the main reason a person seeks the services of an optometrist or ophthalmologist. But what does it really mean when we're told that our vision is blurry because http://www.allaboutvision.com/eye-exam/refraction.htm we have a refractive error? We see the world around us because of the way our eyes bend (refract) light. Refractive errors are optical imperfections that prevent the eye from properly focusing light, causing blurred http://yoursightmatters.com/conditions/refractive-errors-vision-problems/ vision. The primary refractive errors are nearsightedness, farsightedness and astigmatism. Refractive errors usually can be "corrected" with eyeglasses or contact lenses, or they can be permanently treated with LASIK and other vision correction surgery refractive error (also called refractive surgery). FIND A DOCTOR: Do you have a refractive error? Find an eye doctor near you to have your eyes checked. > How Light Travels Through the Eye In order to see, we must have light. While we don't fully understand all the different properties of light, we do have an idea of how light travels. Watch this video on what causes blurry vision and how double vision refractive we can correct it. A light ray can be deflected, reflected, bent or absorbed, depending on the different substances it encounters. When light travels through water or a lens, for example, its path is bent or refracted. 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. Most refraction in the eye occurs when light rays travel through the curved, clear front surface of the eye (cornea). The eye's natural (crystalline) lens also bends light rays. Even the eye's tear film and internal fluids (aqueous humor and vitreous) have refractive abilities. Recommended For You Pay for your family's vision care with a CareCredit credit card Learn how Optometry Giving Sight helps 670 million people to see again Questions about cataracts? Find all the answers in My Cataract Journey Save 10-30% off your eye exam using the BenefitsPal™ card How the Eye Sees 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. For good vision, this focus point must be on the retina. The retina is the tissue that lines t
Surgery Cost Questions For Your Surgeon Technology IOLS Glaucoma Glaucoma Risk Assessment Traditional Glaucoma Treatment Methods Laser Surgery Glaucoma Treatment Options Emerging Glaucoma Treatments Testimonials Conditions Conjunctivitis Corneal Infections Corneal Dystrophy Diabetic Retinopathy Droopy Eyelids Dry Eye Keratoconus Macular Degeneration Periocular Skin Cancer Pterygium Refractive Errors (Vision Problems) Retinal Detachment Eye Surgery Blepharoplasty / Eyelid Revision Procedures Cataract Surgery and Intraocular Lens Implants (IOL) Corneal Transplants LASIK Refractive Lensectomy Vitrectomy YAG Laser Procedure Prevention Diabetes and Eye Care Comprehensive Eye Exams Save Your Vision Eye Health FAQs Eye Health - Did You Know? Tools You Can Use News Cataracts Cataract Symptoms Risk Factors Exam Overview Cataract Surgery Laser-Assisted Cataract Surgery Preparing for Surgery Cataract Surgery Cost Questions For Your Surgeon Technology IOLS Glaucoma Glaucoma Risk Assessment Traditional Glaucoma Treatment Methods Laser Surgery Glaucoma Treatment Options Emerging Glaucoma Treatments Testimonials Conditions Conjunctivitis Corneal Infections Corneal Dystrophy Diabetic Retinopathy Droopy Eyelids Dry Eye Keratoconus Macular Degeneration Periocular Skin Cancer Pterygium Refractive Errors (Vision Problems) Retinal Detachment Eye Surgery Blepharoplasty / Eyelid Revision Procedures Cataract Surgery and Intraocular Lens Implants (IOL) Corneal Transplants LASIK Refractive Lensectomy Vitrectomy YAG Laser Procedure Prevention Diabetes and Eye Care Comprehensive Eye Exams Save Your Vision Eye Health FAQs Eye Health - Did You Know? Tools You Can Use News Home / Conditions / Refractive Errors (Vision Problems) Refractive Errors (Vision Problems) Overview We must have light in order to see. Most common vision problems are caused by refractive errors â