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emmetropia    
n. 正常眼

正常眼

emmetropia
n 1: (ophthalmology) the normal refractive condition of the eye
in which there is clear focus of light on the retina


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  • Emmetropia - Wikipedia
    Emmetropia is a state in which the eye is relaxed and focused on an object more than 6 meters or 20 feet away The light rays coming from that object are essentially parallel, and the rays are focused on the retina without effort
  • Emmetropia - All About Vision
    Emmetropia ("em-eh-TROE-pee-ah") is the medical term for naturally occurring clear vision In other words, a person with emmetropia does not have any refractive errors — such as nearsightedness (myopia), farsightedness (hyperopia) or astigmatism
  • Is Emmetropia Normal? Only 35% of People Have It
    Emmetropia is the normal, ideal refractive state of the eye It means light focuses directly on the retina without any corrective lenses, producing clear distance vision
  • Emmetropia: Definition, Causes, and Comparison with Ametropia
    If a person has emmetropic eyes, light rays entering the eye from a distance are directly focused on the retina, resulting in normal vision (emmetropia), otherwise, they will have ametropia
  • Emmetropia – The perfect imperfection - PMC
    Emmetropia is the basis of our understanding of the ocular optical system When we are referring to an emmetropic eye, we are thinking of an eye with a perfect optical system
  • Emmetropia - Optometrists. org
    What is emmetropia? Emmetropia is the clinical term used by eye doctors to describe a person with perfect vision, also known as ‘20 20 sight’ This ideal condition describes an eye that has no refractive error or visual defects The light that enters an emmetropic eye focuses perfectly on the retina, producing a precise, clear and crisp image
  • Emmetropia - Academy Eye Associates
    Emmetropia is the medical term for 20 20 vision, vision that needs no corrective lenses, contact lenses, or reading glasses It occurs because the optical power of the eye can perfectly focus an image to the retina, giving it “perfect” vision The opposite of emmetropia is ametropia
  • The Gold Standard of Vision: What Is Emmetropia? | OBN
    Emmetropia and ametropia are terms used to describe different states of vision While emmetropia refers to a healthy eye that is capable of focusing light properly, ametropia refers to an eye that has a visual defect and is unable to focus light properly
  • What Is Emmetropia? How the Eye Achieves Perfect Vision
    Learn the precise definition of emmetropia and the crucial balance between refractive power and axial length that creates uncorrected perfect vision
  • Emmetropia Ametropia: What Is the Difference? - NVISION
    Learn the difference between emmetropia and ametropia, signs that your eyes may have refractive errors, and advice for protecting your vision





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