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accommodation

Accommodation

Accommodation: natural mechanism to see accommodation helps the human eye to see net at different distances: its mechanism involves a contraction of the ciliary muscle, which induces a passive bulge of the lens due to its suspensory ligament (called zonule) is released. It is this bulge (increase in curvature) which allows [...]

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The lens

The lens of the eye: role and Anatomy the lens is a natural optical lens of the eye that is involved in focusing light on the retina and accommodation (focus in near vision). The young lens is flexible, transparent, and has a form of elliptical edge in Cup.  It is located [...]

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Hyperopia and presbyopia

Hyperopia and presbyopia are two common optical defects, which can be added and penalize the vision of far and near, making it necessary to port a lens correction (glasses, lenses) for all activities of daily living. This page is dedicated to the explanations to understand the commonalities and differences between hypermetropia and presbyopia, [...]

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Prevalence of presbyopia

Presbyopia: prevalence presbyopia is a condition caused by a change in the elasticity of the lens occurs with age. This reduction of the elasticity of the crystalline lens results in a gradual reduction of the power of accommodation: near vision becomes more and more blurred. The age of entry in presbyopia is relatively constant: between 43 and [...]

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Myopia and presbyopia

The presbyopia affects the vision of nearly 45-year-old nearsighted people: myopia and presbyopia may undergo a refractive surgery operation. Myopia and Presbyopia: links and differences contrary to a widespread belief, myopia does not protect presbyopia: Any myopic over 45 years of age is far-sighted. […]

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The multifocalite master

This page is dedicated to the design of a multifocal correction optimized for the presbyopia. It outlines a personalized multifocal correction method based on a non-empirical approach, which we conceived in the early 2000s and for which an international patent has been filed ocular wavefront-correction profiling United States Patent 20060023162 [...]

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Presbyopia

Presbyopia: Definition The presbyopia corresponds to a near-vision discomfort that appears shortly after the age of 40 years, and is caused by the gradual reduction of the eye's ability to perform the focus in close vision (the mechanisms of the human eye For close vision are explained on the [...]

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Hyperopia surgery

The operation to correct farsightedness hyperopia surgery is commonly done in refractive surgery to rid the farsighted patients of their glasses and lenses. Hyperopia is a frequent, sometimes unknown (up to 40) and mainly caused by a too "short" look, or a cornea whose power is insufficient for converging sufficiently light [...]

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