Prisms induced by optical descentrations in the lenses of free sale with reference of ophthalmic lenses and evaluation of the visual comfort in presbyope patients over 40 years

Abstract

Objectives: Materials and <em><strong>Methods:</strong></em> 50 patients présbitas users only for vision correction next. Each patient is carried out an initial examination optometrists and prescribed initially lenses or magnifying glasses Magnifico and then prescribed ophthalmic lenses. After 15 days of using the magnificent and magnifying glasses at the time using the optical quality of ophthalmic lenses known, took place controls where the patient was given a survey that diligence according to their experience with the usage time of magnifying glasses and ophthalmic lenses, in order to analyze and compare possible symptoms when using the two forms of visual correction and explaining why the patient has difficulty in adapting their prescription optics. All lenses were measured power, optical centers and turn off the lenses that generate prisms induced in each of the lenses. Were compared with each other and with the survey to determine which of these visual and produced more uncomfortable astenopia. <em><strong>Results:</strong></em> we found a statistically significant difference when comparing the prisms off and induced between the two types of lenses. Conclusions: this study confirms that the use of nonprescription lenses do not cover the same way the visual need of each patient and hence arises the different symptoms and intolerance to such lenses.