Weniger optische abberationen und bessere sehscharfe durch aspharische weiche kontaktlinsen (Optical and visual performance of aspheric soft contact lenses)
Efron, Suzanne, Efron, Nathan, & Morgan, Philip B. (2008) Weniger optische abberationen und bessere sehscharfe durch aspharische weiche kontaktlinsen (Optical and visual performance of aspheric soft contact lenses). Optometry and Vision Science, 85(3), pp. 201-210.
Purpose. This study was conducted to investigate whether aspheric design soft contact lenses reduce ocular aberrations and result in better visual acuity and subjective appreciation of clinical performance compared with spherical soft contact lenses.
Methods. A unilateral, double-masked, randomized and controlled study was undertaken in which ocular aberrations and high and low contrast logMAR visual acuity were measured on myopic subjects who wore aspheric design (Biomedics 55 Evolution, CooperVision) and spherical design (Biomedics 55, CooperVision) soft contact lenses. Ten subjects who had about -2.00 D myopia wore -2.00 D lenses and 10 subjects who had about -5.00 D myopia wore -5.00 D lenses. Measurements were made under photopic and mesopic lighting conditions. Subjects were invited to grade comfort, vision in photopic and mesopic conditions, and overall impression with the two lens types on 100 unit visual analogue scales.
Results. There was no significant difference in high contrast or low contrast visual acuity between the two lens designs of either power under photopic or mesopic conditions. Both lens designs displayed lower levels of spherical aberration compared with the no lens condition under photopic and mesopic light levels (p < 0.0001); however, there were no differences in aberrations between aspheric and spherical lens designs. There were no statistically significant differences in subjective appreciation of clinical performance between lens designs or lens powers.
Conclusions. At least with respect to the brand of lenses tested, the fitting of aspheric design soft contact lenses does not result in superior visual acuity, aberration control, or subjective appreciation compared with equivalent spherical design soft contact lenses.
Impact and interest:
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|Item Type:||Journal Article|
|Additional Information:||This article can be accessed free of charge from the journal website 12 months after the publication date. See Official URL above.|
|Keywords:||Aberrations, Aspheric lens design, Soft contact lens, Subjective appreciation, Visual acuity, OAVJ|
|Subjects:||Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Vision Science (111303)|
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health|
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
|Deposited On:||13 May 2009 12:21|
|Last Modified:||29 Feb 2012 23:51|
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