Article
Experimental study of visual performance using aspheric contact lenses of the simultaneous type to correct presbyopia
Search Medline for
Authors
-
F. Riederle
- Department of Ophthalmology, University of Ulm
-
H. M. Riederle
- Department of Ophthalmology, University of Ulm
-
G. K. Lang
- Department of Ophthalmology, University of Ulm
-
C. W. Spraul
- Department of Ophthalmology, University of Ulm
| Published: | September 22, 2004 |
|---|
Outline
Text
Objective
In the today's society juvenile appearance and activity also in the second half of the life has an increasingly higher value. This is associated with an increasing demand for multifocal contact lenses in order to avoid spectacles in presbyopic individuals. The purpose of this prospective study was to evaluate visual function of two aspheric, soft, multifocal contact lenses of two different manufacturers with special regard to visual acuity and contrast sensitivity and compare them with conventional correction with spectacles in presbyopic persons.
Methods
Thirty presbyopic volunteers with a best corrected visual acuity for distance vision > 0.8 and near vision > 0.9 participated in this study. Measurement of visual acuity and contrast sensitivity was performed with conventional spectacles and with the multifocal contact lenses Prémiane/Precilens and Dispo Multi Focal-Lens (Bach Optik, Cologne). The following parameters were investigated: visual acuity (distance and near) and contrast sensitivity (spatial frequencies 1.5, 3, 6, 12, 18 cycles/degree) for day vision (distance and near) with and without glare (Multivision Contrast Tester 8000).
Results
The results of visual acuity (distance and near) were significantly worse with both contact lenses in comparison to the correction using spectacles (p < 0.05). There was no significant difference in visual acuity (distance and near) between both contact lenses. Studying contrast sensitivity, there was also no significant difference between both contact lenses concerning all tested parameters. However, contrast sensitivity was significantly better with spectacles in comparison to both contact lenses for near vision (with and without glare), as well as for distance vision (with glare) for high and intermediate spatial frequencies (p < 0.05). There was no difference between spectacles and contact lenses concerning low spatial frequencies, as well as all frequencies for distance vision (without glare).
Conclusions
In our study, correction of presbyopia with multifocal contact lenses in comparison to conventional spectacles showed a significant reduction of visual acuity, as well as contrast sensitivity. However, in a daylight situation with high contrast visual tasks the multifocal contact lenses performed comparable to the correction with glasses.
