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Development of a questionnaire to assess subjective vision score in myopes seeking refractive surgery
Graham Fraenkel1, lan F Comaish, Michael A Lawless
1The Eye Institute, Chatswood, Australia.
Purpose:
To assess vision in patients with myopia and myopic astigmatism before and after refractive surgery.
Methods:
A prospective controlled study of visual quality amongst myopes and astigmatic myopes. Focus groups, ophthalmic surgeons, and questionnaire experts devised a Subjective Vision Questionnaire (SVQ), modified after a pilot trial. Participants were administered the SVQ before clinical evaluation. Items answered by over 95%, with factor loadings > 0.55 were included. Test-retest reliability was assessed by repeat testing. Factor analysis identified groups of questions measuring particular dimensions of data.
Results:
Sixty-seven items were answered by 128 patients and reduced to 24 items in a final questionnaire. Factor analysis identified six types of questions within the questionnaire, the most important of which was related to driving.
Conclusion:
The simplicity, low cost, and psychometric properties of the Subjective Vision Questionnaire support its use clinically and in research.
