[Experimental experiences with balloon-shaped capsular sac implantation with reference to accommodation outcome in...

Implantation of a balloon into the capsular bag theoretically allows the injection of fluid materials for lens replacement, thus enabling accommodation. Leakage of the fluid can be avoided in this way, and a large variety of potential materials can be tested without taking into account their effect on ocular tissue. We tested ellipsoid balloons made of polydimethylsiloxane. The balloons had a maximum diameter of 11.0 mm and a wall thickness of 0.15 mm. After capsulorhexis of 2.5 mm and phacoemulsification, the balloons were implanted in enucleated pig eyes and filled with 2% methylcellulose or silicone oil through little tubes on the anterior side. Implantation of the balloons into the capsular sac was much more difficult than normal IOL implantation into the posterior chamber. We had to enlarge the tunnel incision to 4.5 mm, and it was technically difficult to leave the relatively strong capsule of the pig intact during implantation. Due to the additional surfaces we found increased reflection. Because of the difficulties described we cannot see any advantages over other refilling techniques.