[ENG]Vision-related quality of life (QoL) analyzes the visual function concerning individual wellbeing
based on activity and social participation. Because QoL is a multivariate construct, a multivariate
statistical method must be used to analyze this construct. In this paper, we present a methodology based
on STATIS multivariate three-way methods to assess the real change in vision-related QoL for myopic
patients by comparing their conditions before and after corneal surgery. We conduct a case study in
Costa Rica to detect the outcomes of patients referred for myopia that underwent refractive surgery.
We consider a descriptive, observational and prospective study. We utilize the NEI VFQ-25 instrument
to measure the vision-related QoL in five different stages over three months. After applying
this instrument/questionnaire, a statistically significant difference was detected between the perceived
QoL levels. In addition, strong correlations were identified with highly similar structures ranging from
0.857 to 0.940. The application of the dual STATIS method found the non-existence of reconceptualization
in myopic patients, but a statistically significant recalibration was identified. Furthermore, a
real change was observed in all patients after surgery. This finding has not been stated previously due
to the limitations of the existing statistical tools. We demonstrated that dual STATIS is a multivariate
method capable of evaluating vision-related QoL data and detecting changes in recalibration and
reconceptualization.
