Staar Collamer posterior chamber phakic intraocular lens to correct myopia and hyperopia

Purpose: To evaluate the efficacy, safety, stability, and predictability of implanting a collagen polymer (Staar Collamer(TM)), posterior chamber phakic intraocular lens (IOL) to correct myopia and hyperopia. Setting: Centre for Advanced Refractive Eye Surgery at the BMI Alexandra Hospital Cheadle, Manchester, United Kingdom. Methods: A Staar Collamer posterior chamber phakic IOL was implanted in 25 eyes of 14 patients with a mean age of 39.7 years (range 20 to 50 years). Seven patients were men and seven women. Sixteen were myopic and 9 hyperopic. Before treatment each patient had a thorough evaluation including refractive, general, ocular, and social and personal histories. The examination included visual acuity, refraction, tonometry, topography, biometry, biomicroscopy, pupil size in dim illumination and posterior segment evaluation by a vitreoretinal specialist. Patients were informed about the surgical process and the expected outcome, their wn expectations were discussed, and their consent to surgery was obtained. Surgical implantation was performed through a less than 3.0 mm clear corneal sutureless incision using brief general anesthesia on a day-case surgical basis. Results: At 3 months postoperatively, all eyes had a significant increase in uncorrected visual acuity, allowing all but two patients (three eyes) to manage most activities without spectacles. Adjustment by incisional corneal surgery was planned for undercorrected myopic eyes (n = 3). Pupil block glaucoma and pigment deposits occurred in one patient each. Conclusion: In this short-term study, the posterior chamber phakic IOL was predictable, safe and efficacious in the correction of myopic and hyperopic refractive errors, with good refractive stability. Long-term follow-up is required to validate that the absence of significant complications in most patients is a lasting phenomenon.