Morphologic compatibility or intraocular lens haptics and the lens capsule.
OBJECTIVE
To evaluate the mechanical relationship between the intraocular lens (IOL) haptic and the capsular bag by quantitatively analyzing the fit of the haptic with the capsule equator and the capsular bag deformity induced by the implanted lens haptics.


METHODS
Division of Morphogenesis, Department of Developmental Biology, National Institute for Basic Biology, Okazaki, Japan.


METHODS
Following implantation of a poly(methyl methacrylate)(PMMA) ring in three excised human capsular bags with continuous curvilinear capsulorhexis (CCC), IOLs with different overall lengths or haptic designs were implanted in the bags and photographed. The straight length of the area of contact between the haptic and the capsule equator on the photographs was measured to provide a quantitative index of in-the-bag fixation and the length from the external margin of the PMMA ring to the external margin of the loop along the maximal diameter of the capsular bag, to indicate the quantitative degree of capsular deformity induced by an IOL.


RESULTS
An IOL with modified-C loops produced better fit along the capsule equator and less deformity than an IOL with modified-J loops, and an IOL with an overall length of 12.0 or 12.5 mm produced a sufficiently good fit and less distortion of the capsular bag than an IOL with an overall length over 13.0 mm.


CONCLUSIONS
An IOL with modified-C loops and an overall length of 12.0 or 12.5 mm is adequate for in-the-bag implantation following CCC.
Nagamoto
T
T
Department of Developmental Biology, National Institute for Basic Biology, Okazaki, Japan.
Eguchi
G
G
D000328:Adult; D001672:Biocompatible Materials; D006801:Humans; D007903:Lens Capsule, Crystalline / Q000473:pathology* / Q000601:surgery; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008875:Middle Aged; D019904:Polymethyl Methacrylate; D011474:Prosthesis Design
D001672:Biocompatible Materials; D019904:Polymethyl Methacrylate