Abstract
Purpose :
This study seeks to assess and compare delivery forces and wound dimensions pre and post-delivery of plate haptic IOLs into porcine eyes with new enhanced injector designed for smaller incision size (CI-26) compared with its predecessor injector (CI-28).
Methods :
Laboratory testing was performed on high (30-31.5D), mid (20-21D), and low (5-7D) powered IOLs by either a trained technician or an experienced cataract surgeon. A dispersive viscoelastic was used for lubrication and all IOLs were loaded per labeling. Delivery forces were measured using a tensile and compression tester (Instron®, Norwood, MA) at a compression rate of 5mm/sec. The peak delivery forces for each injector and IOL powers were collected and compared. Incision size and wound stretch was also assessed ex-vivo using porcine eyes. A 2.8mm clear corneal incision was created for CI-28 and a 2.6mm clear corneal incision was created for CI-26. Incision gauges were used to assess incision sizes pre and post delivery and subjective observations were annotated.
Results :
Mean peak delivery forces for CI-26 were slightly lower for low powered IOLs (CI-28: 737.2gf vs. CI-26: 679.8gf) and higher for mid to high powered lenses (CI-28: 443.2gf vs. CI-26: 693.8gf; CI-28: 608.4gf vs. CI-26: 1067.5gf, respectively). Delivery was normal for all samples with no trapping of haptics by the plunger. Mean incision size (±SD) post-delivery was slightly larger than the initial incision for all IOL powers tested [CI-28: 3.0mm (±0.03mm); CI-26: 2.82mm (±0.04mm)]. Average wound stretch was similar (CI-28: 0.21mm, 7.5%; CI-26: 0.22mm, 8.5%) Wound architecture was intact with no tears. A technique adjustment was needed for CI-26 to account for delivery speed for higher powered IOLs.
Conclusions :
The new enhanced injector system consistently delivered a plate haptic intraocular lens of varying powers through a smaller incision size (~0.2 mm) as compared to its predecessor injector. Delivery forces for the new injector increased with mid to high powered IOLs which accounted for the quicker delivery speed and slight technique adjustment.
This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.