Biomedical subjects
R S Brodstein
Publications and source records attributed to R S Brodstein.
Long-term course of surgically induced astigmatism.
We performed an analysis of surgically induced astigmatism in 229 cases of extracapsular cataract extraction and posterior chamber lens implantation. The average length of follow-up for patients in this study was 34.4 months (2.87 years). We found that surgically induced astigmatism continued to change for at least three years after surgery. The preoperative astigmatism was found to have only minimal effect on the postoperative astigmatism if the corneal curvature was controlled with keratometry at the time of surgery. The optimal amount of with-the-rule astigmatism at three to five weeks postoperatively was found to be 0.75 diopter to 1.25 diopters for one surgeon and surgical technique.
Clinical evaluation of six intraocular lens calculation formulas.
We examined the results of posterior chamber intraocular lens (IOL) implantation and evaluated six commonly used IOL power calculation formulas (original Binkhorst, modified Binkhorst, Colenbrander, Shammas, Hoffer, and SRK regression) to determine which ones produce the most accurate and predictable results. We found that the accuracy of the various formulas depends upon several factors, including the surgeon's technique, the type and style of posterior chamber IOL implanted, and the axial length of the eye being operated on. Furthermore, we found that the results using the different formulas vary in a consistent pattern. Surgeons must therefore evaluate their cases periodically to determine which formulas and IOL styles will provide their patients with the most accurate and satisfying results.
The treatment of myopia with atropine and bifocals. A long-term prospective study.
Two hundred fifty-three patients were followed for up to nine years (mean, 4 1/4 years). They were on a regimen of atropine 1% once a day in an attempt to retard myopic progression. Their rate of myopic progression prior to atropine treatment was compared with 146 controls. The rates of myopic progression during and after treatment were also compared to those of the controls. The results from several analyses showed a marked flattening in the rate of myopic progression during treatment, and the rate of myopic progression after treatment ran parallel to those in the control group. Age in relation to myopic progression was evaluated in subgroups. A variation existed in the rate of myopic progression in the controls. The fastest rate of myopic progression occurred between eight and 12 years of age, and the slowest rate of myopic progression developed in those patients over 18 years of age.
Hyphema syndrome with anterior lenses.
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