The VF-14 index of functional visual impairment in candidates for a corneal graft.
OBJECTIVE
To validate the Visual Function-14 (VF-14) index of functional visual impairment in candidates for a corneal graft.


METHODS
One hundred thirty-four patients who were candidates for a corneal graft participated in this study between August 1996 and February 1997. Demographic, ocular history, best-corrected visual acuity, and detailed ocular examination data were collected. Functional visual impairment information was obtained by telephone interviews using the following: VF-14, SF-36 (Short Form-36, a more generic measure of general health function), and Visual Symptom Score, and four questions measuring the overall amount of trouble with vision, dissatisfaction with vision, ocular pain, and discomfort.


RESULTS
The average age of corneal graft candidates was 64 +/- 18 years (range, 18 to 90 years) and 60% were women. The most frequent corneal disease was pseudophakic bullous keratopathy (41%). Ocular comorbidities included glaucoma or ocular hypertension (30%) and cataract (19%). The mean best-corrected visual acuity of the eye scheduled for surgery was 1.33 +/- 0.56 logMAR whereas the best eye best-corrected visual acuity was 0.36 +/- 0.44 logMAR. The mean VF-14 score was 73% +/- 26%, and the internal consistency was high, with a Cronbach alpha value of 0.94. The VF-14 correlated strongly with the best eye best-corrected visual acuity. It also correlated strongly with the Visual Symptom Score, the global measures of trouble and dissatisfaction with vision. Candidates for a corneal graft had low scores for all eight general health concepts evaluated with the SF-36, and the VF-14 correlated with seven of the eight SF-36 subscales.


CONCLUSIONS
The VF-14 is a valid measure of functional visual impairment in candidates for a corneal graft. The Visual Symptom Score and the SF-36 are also useful indices in such patients.
Boisjoly
H
H
Maisonneuve-Rosemont Hospital, University of Montreal, Canada.
Gresset
J
J
Fontaine
N
N
Charest
M
M
Brunette
I
I
LeFrançois
M
M
Deschênes
J
J
Bazin
R
R
Laughrea
P A
PA
Dubé
I
I
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002386:Cataract / Q000150:complications; D003316:Corneal Diseases / Q000150:complications* / Q000503:physiopathology / Q000601:surgery; D016039:Corneal Transplantation; D005260:Female; D005901:Glaucoma / Q000150:complications; D006291:Health Policy; D006302:Health Services Research; D006304:Health Status; D006306:Health Surveys; D006801:Humans; D008297:Male; D008875:Middle Aged; D011788:Quality of Life; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D014792:Visual Acuity / Q000502:physiology