Intraocular lens movement caused by ciliary muscle contraction.
OBJECTIVE
To investigate intraocular lens (IOL) movement, measured as a change in anterior chamber depth (ACD) caused by pilocarpine-induced ciliary muscle contraction.


METHODS
Department of Ophthalmology, University of Vienna, Vienna, Austria.


METHODS
In this prospective study, the ACD was measured using high-precision, high-resolution, dual-beam partial coherence interferometry in 62 pseudophakic eyes of 55 patients under pilocarpine- and cyclopentolate-induced ciliary muscle contraction and relaxation. The following were studied: 2 models of a ring-haptic IOL (designed to accommodate), a plate-haptic IOL, and 3 types of 3-piece IOLs. Measurements were performed 3 months after surgery.


RESULTS
The ring-haptic IOLs and plate-haptic IOL showed a forward movement (ring haptic 43A, -116 microm; ring haptic 43E, -222 microm; plate haptic -162 microm). The 3-piece IOLs showed no change in ACD except in 1 IOL type in which there was backward movement (156 microm).


CONCLUSIONS
Pilocarpine-induced ciliary muscle contraction caused forward movement of ring- and plate-haptic IOLs that resulted in an estimated accommodative amplitude of less than 0.50 diopter in most cases. The accommodating ring-haptic IOLs did not perform better than the conventional plate-haptic IOL.
Findl
Oliver
O
Department of Ophthalmology, University of Vienna, Austria. oliver.findl@akh-wien.ac.at
Kiss
Barbara
B
Petternel
Vanessa
V
Menapace
Rupert
R
Georgopoulos
Michael
M
Rainer
Georg
G
Drexler
Wolfgang
W
D000065:Accommodation, Ocular / Q000502:physiology*; D000368:Aged; D000369:Aged, 80 and over; D000867:Anterior Chamber / Q000000981:diagnostic imaging / Q000502:physiology; D019923:Capsulorhexis; D002924:Ciliary Body / Q000000981:diagnostic imaging / Q000502:physiology*; D003519:Cyclopentolate / Q000494:pharmacology; D006801:Humans; D007368:Interferometry; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008027:Light; D008875:Middle Aged; D009119:Muscle Contraction / Q000187:drug effects / Q000502:physiology*; D009130:Muscle, Smooth / Q000000981:diagnostic imaging / Q000502:physiology*; D010276:Parasympatholytics / Q000494:pharmacology; D018918:Phacoemulsification; D010862:Pilocarpine / Q000494:pharmacology; D011446:Prospective Studies; D019591:Pseudophakia / Q000000981:diagnostic imaging / Q000503:physiopathology*; D014054:Tomography; D014463:Ultrasonography
D010276:Parasympatholytics; D010862:Pilocarpine; D003519:Cyclopentolate