Soft contact lens visual performance: a multicenter study.
The present investigation concerns the evaluation of the visual performance of two groups of subjects, each by a different investigator, while wearing two contact lens corrections (Acuvue and SeeQuence) and spectacles. The investigation involved the measurements of visual acuity with Logmar progression charts (Regan contrast sensitivity letter charts) of two different contrasts (92% and 6%) at two luminance levels (250 and 2.5 cd/m2) and the evaluation by questionnaire of the subjects' visual acceptance. The results obtained showed that the investigation routine was: (1) highly sensitive at detecting differences in acuity between lens types that were associated with differences in clinical acceptance, and (2) highly reliable at reaching similar conclusions for differences between corrections, even when used by different investigators on independent subject groups. In addition, the investigation has shown that Acuvue achieved similar visual performance to that of the full spherocylindrical spectacle correction, and a significantly better visual acuity and visual acceptance than SeeQuence.
Gullon
M
M
Contact Lens Research Consultants, Pimlico, London, England.
Schock
S E
SE
D000704:Analysis of Variance; D003263:Contact Lenses, Hydrophilic; D015350:Contrast Sensitivity / Q000502:physiology; D004209:Disposable Equipment; D004311:Double-Blind Method; D005069:Evaluation Studies as Topic; D005139:Eyeglasses; D005260:Female; D006801:Humans; D008027:Light; D008297:Male; D011897:Random Allocation; D011795:Surveys and Questionnaires; D014792:Visual Acuity / Q000502:physiology*