THE REPEATABILITY OF SUBJECTIVE REFRACTION, VISUAL ACUITY, AND REFRACTIVE ERROR-SPECIFIC QUALITY OF LIFE SURVEY INSTRUMENTS

Mario Saracino

Abstract

PURPOSE. Quality of life outcomes are becoming important when examining refractive error correction with spectacles, contact lenses, or refractive surgery. The purpose of this study was to examine the repeatability of two refractive error-specific quality of life survey instruments and compare these outcomes to traditional measures of visual performance. METHOD. Self-administered versions of the National Eye Institute Refractive Error Questionnaire (NEI-REQ) and the Refractive Status and Vision Profile (RSVP) survey were administered in random order to patients. Subjective refraction and high-contrast, log MAR visual acuity measurements were performed after completion of the first survey. Patient then completed the other survey instrument. Patients were asked to return for a second examination approximately 30 days later, at which time, the same test sequence was performed. All examinations were performed by a single examiner.

RESULTS. Twenty-six subjects (46% females) were enrolled in this study with an average (±SD) age of 33 ± 9 years. The average time elapsed between visits was 24 ± 2 days. The average difference between visits in subjective refraction (spherical equivalent) was - 0.005 D (95% Limits of Agreement (LoA) =- 0.11 D to 0.10 D). The average difference between visits in high contrast, logMAR visual acuity was- 0.03 (95% LoA =- 0.06 to- 0.01). The average difference between visits in the overall score for the NEI-REQ survey was 0.27 (95% LoA = -1.25 to 1.80). The average difference between visits in the overall score for the RSVP survey was- 0.32 (95% LoA =- 3.15 to 2.51).

CONCLUSIONS. Subjective refraction and visual acuity are relatively constant over a short period of time. These results suggest that refractive-error specific quality of life survey instruments also show good repeatability over this same period of time.

Details

Year: 2001

Program Number: Poster 88

Author Affiliation: The Ohio State University

Co-Authors: Jason Nichols, Lynn Mitchell, Karla Zadnik

Co-Author Affiliation: The Ohio State University, The Ohio State University, The Ohio State University

Room: Exhibit Hall C