T he eye’s ability to accommodate is progressively lost with age, which is why this phenomenon is called presbyopia (from the Greek words présbys, meaning old, and ōps, meaning eyes). The condition can be treated with corrective lenses, a method that has been widely used for a long time; however, this approach may not be the most comfortable treatment option for the patient. Today, patients hav...

introduction: among the components of the extracellular matrix (ecm) and basement membrane (bm), laminitis heterotrimeric glycoprotein (laminin) and collagen type iv are the most important. in a previous study we have examined the role of collagen type iv in the developing lens capsule. the present study aims to determine the appearance and distribution of laminin in the bm and ecm of lenses du...

In this paper, the optimal Fresnel lenses are designed by Zemax software.The fundamental problem of the Fresnel lenses is the beam divergence, which wasresolved by decreeing the output stain diameter on the image plane. For this purpose,two types of radial and cylindrical Fresnel lenses are simulated with different groovesusing Global and Hammer optimization methods. The minimum output stain di...

Results The average number of lesions per patient detected before diagnosis was 3.5 ± 2.9 [1-26]. The mean number of lesions was 1 ± 0.9 by radiographs, 2.45 ± 1.7 by isotopic bone scan and 3.12 ± 1.33 by MRI. A total of 193 radiographic lesions were detected with the following distribution: tibia (n = 44), the clavicle (n = 34), the femur (n = 23), the fibula (n = 20) and pelvis (n = 19). The ...

Purpose: To evaluate the near visual performance of an accommodative intraocular lens (IOL); Tetraflex, in comparison to a standard monofocal foldable IOL in cataract surgery. Setting: Eye Research Center, Farabi Eye Hospital, Department of Ophthalmology, Tehran University of Medical Sciences, Iran. Methods: Forty six eyes of 23 patients with cataract underwent phacoemulsification and accommoda...

PURPOSE To assess the efficacy of the Tetraflex (Lenstec Inc) intraocular lens (IOL) to provide enhanced near reading ability and spectacle independence relative to a monofocal control IOL in bilaterally implanted eyes tested binocularly. METHODS A prospective, age-matched, non-randomized US Food and Drug Administration clinical trial of 255 Tetraflex and 101 monofocal IOL control patients wa...