In the implantation of intraocular lenses (IOL) stringent requirements are made on achieving the refractive target. This necessitates the exact determination of the basic data needed for IOL power calculation – both the axial length and, in particular, the corneal power – and additionally the cylinder power and its axis in the case of a toric lens. This gives rise to the question, especially fo...

In the current era of presbyopia-correcting intraocular lenses (IOLs), toric IOLs and aspheric IOL technology, the practice milieu is changing. Informed consent takes on newmeaning when the surgeon and the patient decide together which IOL technology represents the best fit for a particular life style and its visual demands. Customizing IOL choice is no longer optional; it is essential to the p...

purpose: to compare acrysof iq and sensar intraocular lens (iols) in terms of spherical aberration and contrast sensitivity.  methods: thirty-four eyes of 34 patients undergoing phacoemulsification cataract surgery were randomly assigned for implantation of acrysof iq or sensar iols. three months postoperatively, best-corrected visual acuity (bcva), spherical aberration (with 4 and 6 mm pupil d...

Foreword These notes cover a short course on symplectic toric manifolds, delivered in six lectures at the summer school on Symplectic Geometry of Integrable Hamiltonian Systems, mostly for graduate students, held at the Centre de Recerca Matemàtica in Barcelona in July of 2001. The goal of this course is to provide a fast elementary introduction to toric manifolds (i.e., smooth toric varieties)...

We study functions on the class group of a toric variety measuring the rates of growth of the cohomology groups of multiples of divisors. We show that these functions are piecewise polynomial with respect to finite polyhedral chamber decompositions. As applications, we express the self-intersection number of a T -Cartier divisor as a linear combination of the volumes of the bounded regions in t...

INTRODUCTION Astigmatism is a visually disabling refractive error, and at least 15%-20% cataract patients have corneal astigmatism of ≥1.50 diopters (D). One way to correct astigmatism simultaneously during cataract surgery is to place limbal relaxing incisions (LRIs). It is possible, however, that late corneal biomechanics may play an unfavorable role in refractive outcomes over time. Toric in...

PURPOSE This study aimed to assess the value of intraoperative aberrometry (IA) in determining the intraocular lens (IOL) sphere power in eyes with no previous ocular surgery. PATIENTS AND METHODS We conducted a retrospective review of patients who underwent uncomplicated cataract surgery where standard preoperative (Preop) measurements and IA were performed. Calculated IOL sphere powers and ...

presbyopia is a major refractive challenge for the coming decades. a variety of surgical procedures like scleral expansion, zonal photorefractive keratectomy, and corneal inlay implantation have been investigated none have yet gained popular acceptance. implantation of intraocular lenses (iols) at the time of cataract surgery or refractive lens exchange provides another opportunity to tackle th...