Matrix formula for intraocular lens power calculation.
نویسنده
چکیده
The matrix calculation was applied to Gaussian optics. Matrices were defined for a single diopter, a lens, an association of two centered systems having the same axis when the origins are taken at the vertices of the first and last refracting surfaces. The matrix formula then was used to calculate the power of the emmetropizing lens implant, and its results compared with the ones obtained by five other formulas.
منابع مشابه
مقایسه‌ی کراتومتری پنتاکم وکراتومتری IOL Master در محاسبه‌ی لنز داخل چشمی افراد با قرنیه‌ی طبیعی
Background and Objective: Proper method and machine for corneal evaluation is an important factor in many anterior segment interventions. This study was performed to compare the mean keratometry (K) readings obtained with an IOL Master and Pentacam for intraocular lens power calculation in normal subjects with no history of refractive surgery. Materials and Methods: Mean K values were obtained ...
متن کاملVisual and Refractive Results of Cataract Surgery by Phacoemulsification Method in Patients with Keratoconus
Purpose: To examine the visual and refractive results of cataract surgery by phacoemulsification method in patients with keratoconus. Methods: In this retrospective study, the files of patients with keratoconus, who underwent phacoemulsification between 2008 and 2017, were evaluated. The intraocular lens power calculation formula was SRK/T. Post-operative visual and refractive results were anal...
متن کاملSRK II formula in the calculation of intraocular lens power.
We studied 400 eyes which underwent cataract extraction with posterior chamber intraocular lens (IOL) implantation to compare the predictive accuracy of various IOL power calculation formulae. The new Sanders-Retzlaff-Kraff (SRK) II formula was more accurate than the original SRK and Binkhorst II formulae. Modification of the A constants used in the SRK II formula to make it 'surgeon specific' ...
متن کاملAccuracy of optical biometry combined with Placido disc corneal topography for intraocular lens power calculation
PURPOSE To investigate the accuracy of a new optical biometer for intraocular lens (IOL) power calculation in eyes undergoing cataract surgery. METHODS Consecutive eyes of patients undergoing cataract surgery with the same IOL model were enrolled in a prospective cohort study. Axial length (AL) and corneal power were measured with an optical biometer based on optical low-coherence interferome...
متن کاملIntraocular Lens Power Calculation after Corneal Refractive Surgery
PURPOSE To determine the accuracy of a method of calculating intraocular lens (IOL) power after corneal refractive surgery. SETTING Department of Ophthalmology, Hospital de Gipuzkoa, San Sebastián, Spain. METHODS The SRK/T formula was modified to use the pre refractive surgery K-value (Kpre) for the effective lens position (ELP) calculation and the post refractive surgery K-value (Kpost) fo...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Investigative ophthalmology & visual science
دوره 31 2 شماره
صفحات -
تاریخ انتشار 1990