Relation between some IOL Injectors and Clear Cornea incision size in the rabbit model

Abstract

 

Purpose:

 

To compare initial and final corneal incision measurements after insertion of intraocular lens during cataract surgery in rabbits using different injectors

 

Methods:

 

Intraocular lenses (IOL) were implanted in 60 eyes of healthy NZW rabbits using 11 models of inserters provided by the manufacturing distributor. After bimanual phacoemulsification, a new 2.0(±0.2) mm clear corneal incision was created with a keratome (1.8 - 2.2 mm). The incision was elongated by 0.2 mm increments until the tip of the inserter fitted the incision and the IOL could be delivered in the capsular bag. Incision sizes were measured before and after the insertion using special corneal microincision gauges designed specifically for this project. The tips of the IOL injectors were measured using a custom-built shadowphotogrammetric imaging system. The mean incision sizes were compared among the groups

 

Results:

 

The average of Initial incision was 2.24(±0.17) mm and for final incision was 2.59 (±0.27) mm. Injectors PhysIOL preloaded have the smallest outer diameter 1.53(± 0.07mm); CROMA preloaded has the largest diameter 2.03(±0.11mm). All incisions were elongated after IOL insertion, and the least and greatest elongation was observed with the PhysIOL Microset 2.25(±0.08mm) and SkyJet 3.06(±0.04mm) resepectively. Higher percentage of enlargement of the incision was observed with NexIJ. (Table 1)

 

Conclusions:

 

The morphology of the corneal incision is a slit that limits the strain to the elastic region of the wound and the incision length is enlarged during the IOL insertionNone of the IOL injectors tested could successfully deliver an IOL through a corneal incision smaller than 2.0 mm. Additional studies are needed in order to achieve statistical significance  

 

Keywords: cataract • astigmatism • anatomy