Abstract
Electronic dynamometry measurements, performed upon intraocular lens (IOL) haptics of prototype one-piece three-loop silicone lenses, accurately defined the relationships between elastic force and haptic displacement. Lens implantations in the capsular bag of dogs (loop span equal to capsular bag diameter, loops undeformed immediately after the operation) were evaluated macrophotographically 5–8 months postoperatively. The highly constant elastic property of silicon rubber permitted quantitative correlation of subsequent in vivo haptic displacement with the resultant force vectors responsible for tissue contraction. The lens optics were well centered in 17 (85%) and slightly offcenter in 3 (15%) of 20 implanted eyes. Of the 60 supporting loops, 28 could be visualized sufficiently well to permit reliable haptic measurement. Of these 28, 20 (71 %) were clearly displaced, ranging from 0.45 mm away from to 1.4 mm towards the lens' optic center. These extremes represented resultant vector forces of 0.20 and 1.23 mN respectively. Quantitative vector analysis permits better understanding of IOL-capsular interactions.
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Supported in part by the Claere Jung Foundation, Hamburg, FRG. Presented in part at the Third Congress of the German Intraocular Lens Implantation Society, Vienna, Austria, March 3, 1989
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Guthoff, R., Abramo, F., Draeger, J. et al. Forces on intraocular lens haptics induced by capsular fibrosis. Graefe's Arch Clin Exp Ophthalmol 228, 363–368 (1990). https://doi.org/10.1007/BF00920063
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DOI: https://doi.org/10.1007/BF00920063