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Was formed, the surface of the Crystalens HD, improving the depth of focus with a proprietary optical modification. The improved optics provides increased depth of focus, which is designed to improve near vision without intermediate or distance vision. The HD lens does this without inducing increased undesirable dysphotopsia or night vision symptoms.
In the study, pre-and post – bronchodilator spirometry has been carried out in all patients. Albuterol was used for determining of postal – bronchodilator FEV / FVC ratio, postal-albuterol FEV percent of foretold normally self given and FEV reversible. All patients had experienced. Self reported symptoms of chronic bronchitis and were current or former smokers with an history on smoking of u003e or= 10 pack-years of more than 1200 as post – bronchodilators FEV / FVC define u003c or= 0.7.