How do you document eye accommodation?

How do you document eye accommodation?

Voluntary accommodation

Accommodation is the ability to focus the eyes quickly and automatically, regardless of the distance to the work. This is essential for activities that require clear and comfortable near vision, as is the case in most jobs where professional work is carried out in offices, or in school activities such as studying or reading.

The optician-optometrist is the health professional in charge of detecting any alterations in accommodation and providing the appropriate treatment by means of optical systems and/or vision therapy.

Disorders of accommodation

Accommodation is a dynamic optical change in the dioptric power of the eye, which allows the eye to modify its point of focus with respect to distant and near objects, in order to form and maintain clear images on the retina. Its measurement is represented in diopters, as is the refractive error.

The increase and decrease of the optical power of the eye is achieved by increasing or decreasing the curvatures of the anterior and posterior surfaces of the lens and by increasing or decreasing the thickness of the lens.

Many are the symptoms and signs that occur when an individual’s accommodation is inadequate, or on the contrary, excessive, or simply because it is not maintained under favorable conditions for a long time.

The amplitude of accommodation is also known as the maximum range of accommodation. And it is the difference between the farthest reading and the closest reading distance at which the text is adequately focused.

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Both are based on the positions of the far point, (farthest point at which the eye can form a sharp image on the retina) and the near point of accommodation (closest point at which the eye can form a sharp image on the retina).

Excessive accommodation signs and symptoms

The causes of refractive disorder are diverse, anatomical or functional, and may involve hormonal, genetic, nutritional factors, systemic diseases or medications. Many drugs modify the optical characteristics of the eye and can cause hyperopia, myopia or functional presbyopia. Ametropias and accommodative disorders of pharmacologic origin are often bilateral, sudden in onset, and transient.

The absence of refractive error or emmetropia is the physiological ability of the eye with relaxed accommodation to focus parallel rays of a distant object onto the fovea of the retina and produce a sharp image.2,3 Ocular refraction is produced by the refractive media: cornea, lens, aqueous humor and vitreous humor. Each has a different refractive power and the cornea is the most powerful, 40 diopters. Ametropia includes refractive anomalies, whereby images are not properly formed on the retina; this is the case of hyperopia, myopia or astigmatism. In myopia, the convergence of the rays occurs in front of the retina and is clinically translated into blurred distance vision. In hyperopia, on the other hand, it occurs behind the retina and there is difficulty in near vision. Astigmatism is caused by different optical powers in different meridians of the cornea and results in blurred vision independent of distance.

Excessive accommodation

RAFAEL BARRAQUER.  Probably, the visual problem that affects more people than any other – there are already more than 2,000 million people in the world – is the so-called presbyopia, that is, the progressive difficulty to see up close without help. Its impact on quality of life is growing in a world where there are more and more tasks that require good vision at short distances, while the active age is getting longer. The problem is not simple, neither in its causes nor in possible remedies, and it is not surprising that its solution is a hot topic in the specialty forums.

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