Artikel
Change of monochromatic aberrations under the influence of tropicamide
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Autoren
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S. Jurkutat
- Klinik für Augenheilkunde der FSU Jena
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B. Loosberg
- Klinik für Augenheilkunde der FSU Jena
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J. Strobel
- Klinik für Augenheilkunde der FSU Jena
| Veröffentlicht: | 22. September 2004 |
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Gliederung
Text
Objective
For wave front based refractive operations reproduceable measurement of monochromatic aberrations is necessary. When clinically examining a patient in mydriasis before such an operation, an influence of the tropicamide is expected which goes beyond the dilated pupil.
Methods
19 probands aged 20-30 with healthy eyes were tested regarding monochromatic aberrations up to the 4th order after dark adaptation and 15 minutes after dropping the tropicamide. The results of both measurements were related to the same pupil diametre of 3, 4.5 and 6 millimetres and were compared with each other.
Results
The spherical aberration (Z4-0) at a pupil diametre of 4.5 and 6 mm is significantly lower under the influence of the tropicamide than without it. The spherical refraction power (Z2-0) at a pupil diametre of 3-6 mm lies by 0.2 dtp above measurements after dark adaptation. The other Zernike coefficients do not differ.
Conclusions
Because the tropicamide affects beside the M. sphingter pupillae also the M. ciliaris, the lens shape and thereby also the spherical aberration and the sherical refraction power are affected. Therefore, for wave front measurements before refractive operations tropicamide should be avoided.
