SUMMARY
Eighty patients with presbyopia were studied in a prospective double blind study with the purpose of evatuating the influence of factors as value of addition, previous use of other optical corrections and kind of refractive errors in the progressive tenses adaptation of different types. Three kinds of progressive tenses were used: Ultravue, Varilux and Vip 70. Each patient used Varilux tenses for one month and Ultravue or Vip tenses for another month. Spectacles were assembted by the same optician with identicat frames 68 patients (85%) adapted themsetves to one type of progressive tenses and 12 (15%) did not get adapted to any of them. The value of additions, the kinds of refrative errors and the kind of spectacles used didn 't influence the progressive tenses adaptation.
The Varilux tenses were chosen in preference to the others and the difference was statistically significant.