Palencia FDC, Orozco VLC, Cáceres-Manrique FM, Camacho LPA

Language: Spanish
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ABSTRACT

Objective: to measure the validity of the NEI-VFQ-25 scale construct in a Colombian population with chronic ocular disease.
Methods: the diagnostic technology was evaluated through Rasch model. A sample was estimated to guarantee the stability of item gaging. Forty to seventy years-old men and women, with chronic bilateral ocular disease, participated. After informed consent, they were applied the NEI-VFQ-25 scale by phone.
Results: two hundred and six persons aged 58.1 years as average, who presented with glaucoma (21.7 %), cataract (36.9 %) or some type of retinopathy (35.4 %). Two items were taken out of the original questionnaire because of differential functioning and four items due to model adjustment. All the questions were then standardized to have three response options, and finally the scale was made up of 17 items which met the validity criteria for construct.
Conclusions: NEI-VFQ scale showed substantial, content, generalization and structural validity for application in 40 to 70 years old people with diagnosis of glaucoma, cataract and retinopathy.