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Lenses Toric Lenses

So far we have seen lenses that compensate myopia and hyperopia . These lenses are spherical are built from 2 radii (one for the first side and one for the second side of the lens), thus the ranking of the lens is the same if measured at 0 º and 90 º.

However, lenses that compensate for astigmatism are toric lenses. We saw that astigmatism occurs because the cornea is not completely spherical, but rather "seems" to a rugby ball. Therefore, the lens compensates for this defect is a ring or cylindrical lens. The graduation of this lens is different in its meridian perpendicular, ie, measured graduation at 0 º and 90 º will not match. Because of this, the value of astigmatism is always associated with an axis between 0 and 180 degrees as when riding a toric lens should be exactly that direction to form a sharp image.

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lenses that compensate for the farsightedness are positive lenses. These lenses are thicker in the central zone, which decreases as we move toward the edge.

These lenses increase the power of eye convergence. As we saw in the post of hyperopia This is because the eye does not have the necessary power to form images on the retina, but they do so behind this. Positive lenses cause light rays that form the image begin to converge before entering the eye, so that the image and will not form behind the retina, but just above it.

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