Preliminary Study of Intraoeular Movement and Accommodative Amplitude of Tetrafiex Accommodative Intraocular Lens

Abstract

Objective To evaluate the relationship between the axial movement and accommodative amplitude of Tetraflex accommodative intraocular lens (Lenstec, Inc., St. Petersburg, FL). Methods Prospective case-control study comprised 20 eyes of 20 patients with age-related cataract who underwent phacoemulsification performed by a single surgeon, 10 of which were implanted with Tetraflex IOLs (Tetraflex group) and the other 10 were implanted with monofocal IOLs with limited accommodation capacity (monofocal group). Uncorrected and best corrected distance, intermediate and near visual acuity, and distance corrected near visual acuity were recorded. The axial movement of the IOL upon the application of 1% pilocarpine eye drops was obtained by anterior segment optical coherence tomography (AS-OCT), and accommodation amplitude was also measured. Results At 3-month follow up, there was no significant difference in uncorrected and best corrected distant visual acuity and best corrected near visual acuity between the two groups (P > 0.05). While the Tetraflex group had significant better uncorrected near visual acuity, intermediate visual acuity and distance corrected near visual acuity than the monofocal group (P < 0.05). The Tetraflex group also had significant greater IOL axial movement and accommodation amplitude than the monofocal group (P < 0.05), and the IOL axial movement was positively correlated with the accommodation amplitude (r=0.977, P=0.000). Conclusions The Tetraflex IOL is a safe and effective way for restoring some level of accommodation, and the amplitude of accommodation is associated with the axial movement of IOL. Tetraflex can provide good distant, intermediate and near visual acuity. Key words: Accomodative intraocular lens; Visual acuity; Axial movement; Accommodative amplitude