Refractive Surgery - Causes and Symptomatology

Myopia

In the case of myopia, the focus is situated before the retina. In most cases, the phenomenon is explained by the eye too large, or the optical system (formed by cornea and lens) "too strong". Hearsay the image formed on retinal level is not "punctual": it is diffuse and hazy. In consequence the brain receive a blurred image of object constituting a really discomfort in the cinema or while driving.

Uncorrected myopia and Corrected myopia

Hyperopia

This visual defect is characterized by the eye insufficiently long or insufficiently strong for its length. The image of some remote object is not formed on retina like in the case of normal eye but behind the retina. The sharp vision is possible only with forced accommodation, which in long time become wearying. The more the hyperopia is high, the more the work is near (reading, writing, detailed work), and the more the visual tiredness increases.

Uncorrected hyperopia and Corrected hyperopia

Astigmatism

The astigmatism disqualifies the clear distinction of forms and details. Fortunately, the toric contact lenses or the spectacles compensate this imperfection like the distorting mirror. Observed in the large proportion of population, the astigmatism is very frequent visual anomaly. The small degree of astigmatism is considered normal and physiologic. This defect arises essentially from corneal or lenticular irregularity, or most often of both. In the case of astigmatic eye, the curvature of cornea or lens is imperfect. For comparison, its profile co rrespond more to the ball of rugby than of football, which represents two unequal perpendicular radiuses. This deformation conducts to the case dependent less correct perception of vertical, oblique or horizontal lines.

Uncorrected astigmatism and Corrected astigmatism

Presbyopia

The presbyopia is not the visual defect but a natural evolution of vision. The cause of this disturbance is the age related alteration of accommodative process of both eyes, particularly the less effective lens performance. In fact, in the course of time the lens losses its elasticity and its bulging capacity. In consequence, the focalisation is more difficult; it alters the clarity of near objects vision. The presbyopia may be added to all visual defects like myopia, hyperopia or astigmatism.

Uncorrected presbyopia et Corrected presbyopia

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