Changes of the convergence accomodation relation (A/CA) and the forias in patiens before and after refractive surgery Lasik

Abstract

The objetive of the study was to determine significant changes of the convergence accomodation relation (A/CA) and the forias in patiens before and after refractive surgery. Methodos: a prospective study for a population sample of 2o patients ( 40 eyes) was submitted to refractive surgery, evaluated by ortoptic in a refractive center OPTILASER in Bogota city (Colombia). It was determined, as inclusion criteria to have been valued by ortoptic before and after the refractive surgery. Conditions such as motored, sensorial, signs, symptoms, visual aharpness, AC/A, binocular vision were evaluated with cover test and with maddox rod. <em><strong>Results:</strong></em> in the measures of forias, it is observed that so much for cover test as for maddox rod, there are not significant statistically changes between the pre and the postsurgical pursuit. The relation AC/A calculated with the method of the heteroforia, had similar values before and after the refractive surgery, statistically there are not significant changes observed; therefore the normal values were maintained in an average of 55% (11 patients) and 65% (13) respectively. As for the patiens with ACA is observed that before the surgery there was 45% ( 9 patients) and after the surgery 65% (6 patients). It fits to stand out that 1 patient (5%) that presented foria before the surgery, is descompensated in the postsurgical treatment generating strabismus in near vision and therefore impossibility in the execution of the appraisal of ACA. Conclusions: the convergence accomodation (AC/A) relation in patients submitted to refractive surgery does not present significant changes, with respect to its initial condition. The cover test and the Maddox rod report differences finding greater alteration in the values of the forias in the maddox rod; that is to say that with the dissociate method was shown a greater value of the same one, finding a significant variation with respect to the value found with the habitual method.