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Biomedical subjects

G W Weinstein

Publications and source records attributed to G W Weinstein.

At least 37 records · Page 2Linked to original sources
PubMed1988

Prediction of post cataract extraction visual acuity: 10 Hz visually evoked potentials.

Cataract patients suspected of having disease that might interfere with good postoperative visual function were evaluated by eliciting monocular steady-state luminance visual evoked potentials (VEPs) with closed eyes at a stimulus rate of 10 flashes/sec. VEPs were rated as either normal or abnormal. Patients with normal VEPs were predicted to have visual acuity of 6/15 (20/50) or better. Patients with abnormal VEPs were predicted to have acuities of 6/18 (20/60) or worse. Postoperative acuities were determined for all patients who underwent surgery and who had no intraoperative or early postoperative complications. The predicted and observed postoperative acuities were quantitatively compared for the 59 patients who met these criteria, using a 2 X 2 contingency table. The chi-square was significant (p less than .001). The overall accuracy of prediction was 80%. Accuracy of the predictions for patients with preoperative acuities of 6/60 (20/200) or better was compared with the accuracy of the predictions for those with preoperative acuities of 60/120 (20/400) or worse. There was no significant difference (p greater than 0.10).

Cataract Extraction↗
PubMed1987

10-Hz flash visual evoked potentials predict post-cataract extraction visual acuity.

Cataract patients suspected of having disease which might interfere with good postoperative visual function were referred for evaluation. Monocular steady-state luminance visual evoked potentials (VEPs) were elicited with closed eyes at a stimulus rate of 10 flashes/sec. VEPs were rated as either normal or abnormal. Patients with normal VEPs were predicted to have an acuity of 6/15 (20/50) or better. Patients with abnormal VEPs were predicted to have acuities of 6/18 (20/60) or worse. Postoperative acuities were determined for all patients who underwent surgery and who had no intraoperative or early postoperative complications. The association of preoperative VEPs and observed postoperative acuities were quantitatively compared by a 2 x 2 contingency table for the 59 eyes which met these criteria. The chi-square was significant (p less than 0.001). The overall accuracy of prediction was 76%. Accuracy was 80% for patients with a preoperative acuity of 6/60 (20/200) or better and 75% for those whose postoperative acuity was 6/120 (20/400) or worse. This difference was not statistically significant.

Cataract Extraction↗
PubMed1987

A new surgical technique for managing sunset syndrome.

Although inferior subluxation of a posterior chamber intraocular lens following extracapsular cataract extraction (sunset syndrome) occurs infrequently, it is difficult to manage. We describe a new, relatively simple technique for managing subluxated posterior chamber intraocular lenses, in which the lens implant is "dialed" forward into the anterior chamber, bringing its haptics to rest in the chamber angle.

Adult↗
PubMed1984

Implantation of the C-loop Simcoe posterior chamber lens.

A simple, one-handed technique of insertion of the popular C-loop Simcoe posterior chamber lens can be achieved without the use of special instrumentation. While a large pupil is preferable, this technique is readily useful for cases where the pupil has constricted. The inferior loop and the lens are placed into the posterior chamber and the capsular bag together. The superior loop is directly placed into the superior capsular fornix. Lens positioning is completed with a modified Sinskey hook.

Humans↗
PubMed1982

Monitoring ophthalmology graduate education. The Residency Review Committee.

Formal monitoring of quality control in American graduate medical education is the task of the residency review committees (RRCs). The RRC for ophthalmology consists of nine members appointed by the American Board of Ophthalmology, the American Academy of Ophthalmology, and the American Medical Association. The RRC meets twice each year to determine the accreditation status of residency training programs. As of 1978, the residents ae board eligible only if they have graduated from accredited programs. The review process is based on data collected in standard hospital information forms and a site survey. An RRC member evaluates this information and makes a recommendation that is discussed and voted on by the nine-member RRC body. In response to pressures for greater quality control and regulatory visibility, the review process has been bolstered by improvements in the data-gathering forms and in the surveyors and by a revision of the minimum requirements for accreditation that provides clearer and more stringent guidelines.

Accreditation↗
PubMed1982

Spontaneous nonpigmented iris cyst.

A histologically proved nonpigmented iris cyst was seen spontaneously in a 22-year-old woman and was removed 14 years later because it enlarged and compromised her vision. The controversy involving the cause and tissue origin of these cysts is discussed. The late age of manifestation together with the histologic characteristics of this cyst favor a "spontaneous" cause arising from tissue of neuroectodermal origin, eg, the nonpigmented ciliary epithelium. The nonpigmented ciliary epithelium. The clinical characteristics of this disorder and means of treatment are reviewed.

Adult↗
PubMed1982

Electroretinography and retinitis pigmentosa. No discrimination between genetic subtypes.

Electroretinography (ERG) has been utilized to claim that the various hereditary subtypes of retinitis pigmentosa (RP) could be distinguished according to the temporal characteristics of the b wave. This study compares two different ERG techniques, one utilizing constant amplitude response and the other balanced photopic and scotopic stimuli, for the early diagnosis of RP. Both methods were found to be reliable objective tests for diagnosing RP. Neither test could differentiate between dominant, autosomal recessive, or X-linked RP.

Adolescent↗