anisometropia การใช้

• Suppression is frequent in children with anisometropia or strabismus or both.
• One cause of significant anisometropia and subsequent aniseikonia has been aphakia.
• Frequently, amblyopia is associated with a combination of anisometropia and strabismus.
• Vision loss can occur and is associated with strabismus, refractive errors, and anisometropia.
• One study estimated that 6 % of those between the ages of 6 and 18 have anisometropia.
• Anisometropia is the condition in which one eye has a different refractive power than the other eye.
• For some patients the removal was only performed on one eye, resulting in the anisometropia / aniseikonia.
• Notwithstanding research performed on the biomechanical, structural and optical characteristics of anisometropic eyes, the underlying reasons for anisometropia are still poorly understood.
• However, there are indications that anisometropia influences the long-term outcome of a surgical correction of an inward squint, and vice versa.
• Moreover, the reduction of the magnification effect of a lens may help with prescriptions that have different powers in the 2 eyes ( anisometropia ).
• This condition has been associated with amblyopia ( in 54 % of cases ), anisometropia ( 26 % ), and strabismus ( 56 % ).
• Several studies have found that anisometropia occurs more frequently and tends to be more severe for persons with high ametropia, and that this is particularly true for myopes.
• Aniseikonia can occur naturally or be induced by the correction of a refractive error, usually anisometropia ( having significantly different refractive errors between each eye ) or antimetropia ( being glasses and contacts.
• In certain types of anisometropia, the visual cortex of the brain will not use both eyes together ( binocular vision ), and will instead suppress the central vision of one of the eyes.
• More specifically, for patients with esotropia who undergo strabismus surgery, anisometropia may be one of the risk factors for developing consecutive exotropia and poor binocular function may be a risk factor for anisometropia to develop or increase.
• More specifically, for patients with esotropia who undergo strabismus surgery, anisometropia may be one of the risk factors for developing consecutive exotropia and poor binocular function may be a risk factor for anisometropia to develop or increase.
• In case of strong anisometropia, contact lenses may be preferable to spectacles because they avoid the problem of visual disparities due to size differences ( aniseikonia ) which is otherwise caused by spectacles in which the refractive power is very different for the two eyes.
• Anisometropia follows a U-shape distribution according to age : it is frequent in infants aged only a few weeks, is more rare in young children, comparatively more frequent in teen-agers and young adults, and more prevalent after presbyopia sets in, progressively increasing into old age.
• A definition that incorporates all of these defines amblyopia as a unilateral condition in which vision in worse than 20 / 20 in the absence of any obvious structural or pathologic anomalies, but with one or more of the following conditions occurring before the age of six : amblyogenic anisometropia, constant unilateral esotropia or exotropia, amblyogenic bilateral isometropia, amblyogenic unilateral or bilateral astigmatism, image degradation.
• Any visual deprivation, that is, anything interfering with such input over a prolonged period of time, such as a cataract, severe eye turn or strabismus, anisometropia ( unequal refractive error between the two eyes ), or covering or patching the eye during medical treatment, will usually result in a severe and permanent decrease in visual acuity and pattern recognition in the affected eye if not treated early in life, a condition known as amblyopia.