Applying normal PedEyeQ thresholds to define reduced quality of life

Patient-reported outcome measures such as the Pediatric Eye Questionnaire (PedEyeQ) are increasingly recognized as important in healthcare assessment. Defining normal PedEyeQ thresholds would allow classification of individual children as having reduced versus normal domain scores. We prospectively enrolled visually normal children (aged 0-17 years; n = 310) to calculate normal PedEyeQ domain thresholds. In addition, 48 children with bilateral visual impairment (VI; best-eye acuity worse than 20/70 or 20/70 or better with limited visual fields) were enrolled for validation. The Child PedEyeQ (four domains) was completed by 5- to 17-year-olds. Parents completed Proxy (five domains) and Parent PedEyeQ (four domains). Each domain was Rasch scored (converted to 0-100); normal thresholds were defined as the 5th percentile of scores in visually normal controls. For Child 5-11 PedEyeQ, 39%-78% of VI children had reduced domain scores, and 88%-100% for 12- to 17-year-olds. For Proxy PedEyeQ, proportions ranged from 55% to 100% and for Parent PedEyeQ ≥83% had reduced scores. High prevalence of reduced PedEyeQ domain scores in the VI cohort, validates the use of normal thresholds. Nevertheless, variability in child self-reporting creates challenges for identifying individual 5- to 11-year-olds with reduced scores.[Formula