97th DOG Annual Meeting 1999
K479
ANALYSIS OF THE DYNAMIC OF THE HUMAN CILIARY MUSCLE DURING ACCOMMODATION
A. Bacskulin1, H. Martin2, T. Terwee3, R. Guthoff1
Background: The magnitude of anterio-axial shifting of the human ciliary muscle during accommodation and ceasing of the ciliary function with advanced age are still unknown.
Material and Method: 100 patients, aged between 10 and 90 years, were investigated by high-resolution ultrasound biomicroscopy during desaccommodation and voluntary accommodation. Utilizing an sepecially developed software programme for semi-automatical contour finding, the accommodative changes of the total area of the ciliary muscle, but also the outer contour were quantified. Correlation with age, residual accommodative range, refraction and A-Scan-Biometry were carried out for each test person.
Results: Independent from age, a significant anterior movement of the total area of the ciliary muscle as well as defined points on the outer contour of the muscle in the dimension of 50 to 90 µm were observed, while the inward displacement was less conspicuous. Correlation with the individual factors of each patients showed no influence on the magnitude of accommodative changes.
Summary: For the first time successful in-vivo analysis of the configural response of the ciliary muscle during accommodation was performed. The new software programme represents the basis for further investigations of the accommodative process. Additional infrared-photorefractometry for continuous measuring of accommodative amplitude is recommended during subsequent examinations.
1Dept. of Ophthalmology , University of Rostock, Doberaner Str. 140,
D-18055 Rostock
2Institiut of Implant -Technology and Biomaterial Rostock
3Pharmacia und Upjohn, Applied Research, NL-9728 NX Groningen
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