Central hole maintains natural aqueous dynamics after implantation of posterior chamber phakic lens
MILAN — Five-year follow-up of a modified posterior chamber implantable Collamer lens with a central hole showed a high safety profile due to the maintenance of natural eye aqueous dynamics.
The Visian ICL V4 (STAAR Surgical) was found in animal experiments to improve the aqueous humor perfusion on the anterior surface of the crystalline lens, preventing the formation of secondary cataract. Clinical studies were performed between 2007 and 2010, and in 2011 the lens received the CE mark.
At the annual joint meeting of Ocular Surgery News and the Italian Society of Ophthalmology, Kimiya Shimizu, MD, who developed the hole-ICL, presented the results of 104 eyes of 72 patients over 5 years. Mean preoperative spherical equivalent was –8 D. Mean age of the patients was 32 years. At 1 day postop, refraction was –1 D, and it remained stable over the entire follow-up. Visual acuity was excellent.
IOP remained stable, with no increase after surgery. Endothelial cell density decreased 1% at 5 years. No pupillary block, infection or cataract was reported.
Shimizu showed the case of a patient implanted with the conventional ICL in one eye and the hole-ICL in the other eye.
"Slight subcapsular lens opacities were detected in the eye implanted with the conventional ICL, while in the other eye the lens was clear," he said.
He said that one of the advantages of this lens is that no peripheral iridectomy is needed, thus avoiding pain and bleeding as well as the risk of bullous keratopathy.
Disclosure: Shimizu has a proprietary interest in the lens.