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Predisposing conditions for amblyopia are: a difference in refraction between eyes, or anisometropia (50%); strabismus (19%); a combination of both (27%); and more rarely, media opacification (4%).
This test can detect strabismus, anisometropia, and changes in the eyes that would indicate the presence of tumors, cataracts, or other anatomical abnormalities.
Dispensing single vision lenses for use at near with decentred optical centres is a simple solution to the problem of anisometropia when reading.
75 dioptres of anisometropia and so if a patient's reading addition is greater than this they should be counselled carefully on the expectations of modified monovision.
The PhotoScreener detects strabismus (crossed eyes), anisometropia (unequal refractive error), near- and far-sightedness, astigmatism, and cataracts in very young children.
In fact, the reduction in visual acuity is not the only abnormality of the eye since amblyopia almost always co-exists with strabismus, anisometropia or both.
As the tint is incorporated into the material, higher power contact lenses with a greater average thickness are more absorptive such that someone with anisometropia might end up with slightly different eye shades.
Professor Evans also promoted the benefits of contact lenses for correcting anisometropia by reducing differential prismatic effects and mitigating aniseikonia.
8) The potential advantages of contact lenses in anisometropia were highlighted by Keith Edwards in 1979, (9) and the optical benefits were demonstrated experimentally by subsequent authors.
We also fit children with anisometropia, where one eye is much worse than the other, we suggest contact lenses to equal vision in both eyes, so the amblyopia disappears.
Table 1 Advantages of contact lenses for sport Optometric Dispensing * Reduction of differential * Protection from UV prismatic effect * Reduction of magnification * Do not steam up differential in anisometropia * Correction of small amounts of * Reduced risk of facial trauma astigmatism with aspherics or GP lenses * No problems with poor fit or frame slipping * Correction of moderate * Improved cosmesis hyperopia when unaided vision is normal to control esophoria * Reduced magnification/ * Full wrap protection from plano minification effect in high sunglasses over contact lenses prescriptions.
The prismatic effect of inaccurate lens centration and anisometropia
a Basic (or intrinsic) aniseikonia could be induced by different refractive powers used in each eye used for the correction of anisometropia
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