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Biomedical subjects

H M Parsons

Publications and source records attributed to H M Parsons.

7 recordsLinked to original sources
PubMed1991

Differential diagnosis of retinoblastoma.

Retinoblastoma is a malignant intraocular tumor of childhood that requires accurate diagnosis and prompt treatment. It is well known that several other ocular conditions of childhood can clinically simulate retinoblastoma. Knowledge of the clinical features that serve to differentiate retinoblastoma from simulating lesions may assist the clinician in arriving at the correct diagnosis and preventing misdirected therapy. This review provides a simple classification of those pseudoretinoblastomas and reviews the recent literature on this subject. It emphasizes the clinical features that help differentiate pseudoretinoblastomas from true retinoblastoma.

Diagnosis, Differential↗
PubMed1972

The bedroom.

Explore the source record for details and available documents.

Beds↗
PubMedDate not supplied

Design of remote control units for seniors.

HumRRO International, Inc. conducted a project to improve the human factors aspects of remote control unit (RCU) design. Although the research was oriented toward RCUs for future telerobots that older adults may use, the RCUs examined were currently available models. An observational study found that a sample of 18 persons aged 65-88 years made errors in performing a simple arithmetic task with four different handheld calculators and that 13 participants made errors operating 11 VCR remotes. Better human-machine designs in RCUs appear to be needed to reduce errors that might cause accidents in the future use of mobile telerobots and their manipulators. In addition, manufacturers of RCUs, gerontologists, and members of SeniorNet, a network of older adults interested in computers, were queried regarding the design of RCUs. The responses of these individuals and the participants in the observational study, together with human factors engineering analyses, suggested numerous design improvements that may be systematically examined.

Aged↗
PubMedDate not supplied

Lesions simulating retinoblastoma.

Of 500 consecutive patients referred to the Ocular Oncology Service at Wills Eye Hospital with the diagnosis of possible retinoblastoma, 288 (58%) were found on clinical evaluation to have retinoblastoma and 212 (42%) had lesions that simulated retinoblastoma. A total of 23 different conditions accounted for the 212 pseudoretinoblastomas. Three most common pseudoretinoblastomas were: persistent hyperplastic primary vitreous (28%), Coats' disease (16%), and presumed ocular toxocariasis (16%). Congenital cataract and retinopathy of prematurity accounted for a much lower percent of pseudoretinoblastomas in this series as compared to a previously reported series. The pertinent clinical features that serve to differentiate these simulating lesions from retinoblastoma are reviewed.

Diagnosis, Differential↗