Development of a questionnaire to assess subjective vision score in myopes seeking refractive surgery.
OBJECTIVE
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.


CONCLUSIONS
The simplicity, low cost, and psychometric properties of the Subjective Vision Questionnaire support its use clinically and in research.
Fraenkel
Graham
G
The Eye Institute, Chatswood, Australia.
Comaish
lan F
lF
Lawless
Michael A
MA
Kelly
Megan R
MR
Dunn
Stewart M
SM
Byth
Karen
K
Webber
Suzanne K
SK
Sutton
Gerard L
GL
Rogers
Christopher M
CM
D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D009216:Myopia / Q000503:physiopathology / Q000601:surgery*; D011594:Psychometrics; D011788:Quality of Life; D018434:Sickness Impact Profile; D011795:Surveys and Questionnaires; D014786:Vision Disorders / Q000503:physiopathology; D014787:Vision Tests / Q000295:instrumentation*; D014785:Vision, Ocular / Q000502:physiology*