Biomedical subjects
Publications and source records attributed to Leonard B Nelson.
Reading difficulties are a complex set of disorders. Current research indicates that these disorders are not caused by vision abnormalities. Treatment of these disorders requires a multidisciplinary approach involving educators, psychologists, and physicians. Parents, physicians, and school officials should understand that there are no quick cures for these children.
PURPOSE: To document progressive growth of a benign iris melanocytoma. METHODS: Interventional case report. A 9-year-old male underwent removal of a pigmented iris tumor that had been documented photographically to double in size. RESULTS: Histopathologic sections revealed a deeply pigmented mass with cytologic features typical of a melanocytoma. CONCLUSION: Although iris melanocytoma is generally a stationary lesion, it can show progressive growth. Such enlargement does not necessarily imply malignant transformation of the lesion.
We report a case of nonaccommodative esotropia developing after bilateral cataract surgery that corrected the preexisting hyperopia in a patient with accommodative esotropia since childhood. The esotropia required surgical correction despite the good visual acuity after the cataract surgery. In patients with preexisting strabismus, there is a possibility of decompensation of adaptive binocular mechanisms after cataract surgery and refractive procedures.
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PURPOSE: To report long-term results with the hang-back technique for medial rectus muscle recession. METHODS: Medical records of 341 consecutive patients who underwent unilateral or bilateral hang-back medial rectus recession were reviewed. The amount of recession was based on the size of the esotropia as measured at near fixation. Patients were divided into two groups according to age at onset of esotropia: patients <1 year comprised group 1 and patients > or = 1 year comprised group 2. Surgical outcomes were analyzed for all patients included in the study. RESULTS: A total of 189 patients met the inclusion criteria. In group 1 patients (n=32), average deviation improved from 48.3 prism diopters (PD) preoperatively to 1.1 PD postoperatively. Eleven patients required a second procedure: 9 with recurrent esotropia and 2 with consecutive exotropia. Average time to second procedure was 27.4 months. In group 2 patients (n=157), average deviation improved from 29.6 PD preoperatively to 1.1 PD postoperatively. Twenty-one patients required a second procedure: 20 with recurrent esotropia and 1 with consecutive exotropia. Average time to second procedure was 22.7 months. CONCLUSION: The hang-back technique represents a safe, effective alternative to conventional medial rectus recession.
PURPOSE: To report our long-term results with the hemihang-back technique for lateral rectus muscle recession in moderate- and large-angle exotropia. PATIENTS AND METHODS: The medical records of 144 consecutive patients who underwent unilateral or bilateral hemihang-back lateral rectus recession between 1999 and 2002 were reviewed. The amount of surgery performed was based on the distance exotropic deviation. Surgical outcomes were analyzed for all patients included in the study. RESULTS: A total of 66 patients met the inclusion criteria. Sixteen patients had undercorrection, but 6 of these patients redeveloped an exodeviation 6 months after the surgery. No overcorrections were observed in this study. CONCLUSION: The hemihang-back technique is a safe and effective alternative to conventional lateral rectus recession in patients with moderate- or large-angle exotropia.
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Explore the source record for details and available documents.
Explore the source record for details and available documents.
PURPOSE: To report long-term results of the hang-back technique for lateral rectus muscle recession. PATIENTS AND METHODS: The medical records of 79 consecutive patients who underwent unilateral or bilateral hang-back lateral rectus recession were reviewed. The amount of surgery performed was based on the distance exotropic deviation. Surgical outcomes were analyzed for all patients included in the study. RESULTS: Forty-two patients met the inclusion criteria. Four of the patients were not orthophoric: three had recurrent exotropia and one had a consecutive esotropia. The average interval prior to the second procedure was 9 months. CONCLUSION: The hang-back technique is a safe and effective alternative to conventional lateral rectus recession.
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