Capsule bag simulation for the dynamic recording of the IOL movement

File Type / Size: Flashmovie, 43 MB
Authors: Eckhard H. Roth, C.G. Hoffmann, H. Ludwig (Düsseldorf)





Description: Questions and Answers: Capillary shrinkage after IOL implantation can lead to vertical displacement, decentering and rotation of the lens. The optical imaging properties in the eye are thus changed. A dynamic simulation of the process allows the process to be recorded in a timely manner. Method: As a capsule pack model, a latex tube closed on one side serves as an evacuatable glass tube. The tube diameter can be varied by pressure variation. The processes are recorded and measured using a camera. Results: Three-fold foldable acrylate lenses with PMMA haptics shift the optics of the lens in compression towards the retina. Single-piece non-foldable PMMA lenses rotate around the optical axis but do not move along the optical axis. One-piece foldable silicone and acrylate lenses with different haptics shift the optics mostly along the optical axis towards the cornea. Conclusions: Openings in the haptics of one-part IOLs may have a buffering effect at initial shrinkage. However, these lenses usually show no other behavior than lenses without these structures. The rotation is model-dependent and can be measured well on toric lenses. Compared to one-part lenses, conventionally produced three-part lenses (PMMA or acrylate) show significantly more stable behavior.
Published in: Klin Monatsbl Augenheilkd 2009; 226: Suppl 1, 1–24
Presented: DGII 2009
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