Intraocular lens movement caused by ciliary muscle contraction

Abstract

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.

A comparison of accommodation amplitudes in pseudophakic eyes measured with three different methods

“…[21][22][23][24][25] There are many studies about the forward movement of various types of IOLs during accommodation effort. [6][7][8][9][10] However, the backward movement is possible with accommodative (AT-45 Crystalens) 26 or with other types of IOLs. 9 The phenomenon based on movement of an IOL is referred as pseudophakic accommodation.…”

“…[1][2][3][4][5] Forward movement of the implanted IOL induced by accommodative effort of the ciliary muscle has also been reported. [6][7][8][9][10] In the recent study, we measured and assessed the amplitude of accommodation in pseudophakic eyes implanted with one of two different types of IOLs with three different methods, one subjective and two objective methods.…”

Accommodating intraocular lenses: a review of design concepts, usage and assessment methods

“…The proposed mechanism of action of the BioComFold is that centripetal compression of the haptic ring with ciliary muscle contraction forces the optic further forwards. 79 Designs 43A and 43E differ in overall diameter (9.8 mm versus 10.2 mm for 43A and 43E, respectively) and haptic angulation (10°versus 12°for 43A and 43E, respectively).…”

“…The movement of the optic in response to pilocarpine stimulation has been analysed by two groups. Legeais and co-workers 106 reported a mean anterior shift of -0.71 Ϯ 0.55 mm one month post-operatively, while Findl and collaborators 79 identified mean movements of just -0.222 Ϯ 0.24 mm for the 43E and -0.116 Ϯ 0.11 mm for the 43A three months after surgery.…”

“…76 Several biometric techniques have been employed including high frequency ultrasonic biomicroscopy, 77 partial coherence interferometry, 60,78,79 Scheimpflug imaging using the IOLMaster (Carl Zeiss, Jena, Germany) 28,80 and anterior segment optical coherence tomography (AS-OCT). 81 Furthermore, a new optical low coherence reflectometry device is now available (LenStar, HaagStreit or Allegro Biograph, Wavelight) 82,83 that can measure lens position to a resolution of 0.01 mm.…”