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Lasers in Medicine: Healing with Light
Published in Suzanne Amador Kane, Boris A. Gelman, Introduction to Physics in Modern Medicine, 2020
Suzanne Amador Kane, Boris A. Gelman
You can observe the effects of a very high power density by performing a simple experiment with sunlight and an ordinary magnifying glass (Figure 3.16). The power density of sunlight in the absence of focusing is not great enough to damage most materials. However, when focused by a large lens, such as a magnifying glass, the intense focused spot can easily set a piece of paper on fire on a sunny day. The cornea and lens of our eyes also can focus the sun's light down to a tiny spot on the retina, and the resulting power density is high enough to create a burn. (For this reason, be careful never to stare into the sunlight, focused or not!).
Portacaval Shunt by Means of Suture and Button
Published in Waldemar L. Olszewski, CRC Handbook of Microsurgery, 2019
J. J. van Dongen, J. M. Maessen, R. J. Oostenbroek, J. E. G. de Boer, G. Kootstra, P. B. Soeters
Several investigators mention the use of an operating microscope or binocular magnifying glass in the performance of a PCS. In large series of PCS the use of optical aids proves to be very fatiguing. When a PCS is performed according to Funovics, a microscope or magnifying spectacles are, in fact, superfluous. Both techniques of PCS are therefore performed in our laboratory without optical aids.
Collection of Peripheral Lymph in Man
Published in Waldemar L. Olszewski, Lymph Stasis: Pathophysiology, Diagnosis and Treatment, 2019
Lymph can also be collected by direct puncture of intact cutaneous lymphatics. The technique has been described by Threefoot. Briefly, PBV is injected intradermally with a 30-gauge needle into the region where lymph is to be collected. After 10 to 20 min, blue streamers are produced. A 23- to 30-gauge needle connected to plastic tubing is then introduced into the dermal lymphatic counter to the flow current. Use of magnifying glasses facilitates the procedure. The syringe is used for gentle aspiration. However, care must be taken not exert a pressure that would collapse the vessel and draw air into the tubing. The fluid is collected in the tubing and its volume can be measured directly. With this method, only several microliters of lymph can be collected.
Simultaneous bilateral cochlear implantation under local anaesthesia in a visually impaired adult with profound sensorineural deafness: A case report
Published in Cochlear Implants International, 2021
Rohma Abrar, Deborah Mawman, Unai Martinez de Estibariz, Devjay Datta, Emma Stapleton
A 46-year old patient first presented to our Otolaryngology department in February 2018 for consideration of a cochlear implant. He had suffered from bilateral progressive deterioration of his hearing since the age of 26. Of note, the patient was registered blind with congenital cataracts and left retinal detachment. This meant that he did not have any vision in the right eye and vision in his left eye was limited to light and dark movement. Despite this, he was able to read with his left eye using a magnifying glass. In addition to visual loss, he also had diet-controlled diabetes and a significant cardiac history with moderate to severely impaired left ventricular dysfunction, hypertrophic cardiomyopathy, previous myocardial infarct in 2012 and VVIR implantable cardioverter defibrillator inserted in 2017. His usual medications included bisoprolol 2.5 mg, ramipril 1.25 mg, spironolactone 25 mg and bumetanide 1 mg, once daily.
How to Design Hospital Settings for Visually Impaired Patients
Published in Hospital Topics, 2021
The author first spoke with a physician from a hospital in Pennsylvania. This provider has been working for the organization's outpatient sector but expressed that the hospital in general (in and outpatient sectors) did not have enough accommodations for those who are visually impaired. According to the provider, even though the hospital has basic things like signaling on the walls and texture on the floor, patients were still very dependent on their caregivers and family. However, in her opinion, more could be done to support those patients. A manager of the same hospital, to whom the author also spoke, added that the hospital offers magnifying glasses to help patients when reading, clocks with large numbers, and mentioned no obstacles. T.V. magnifiers, different colored dishes to provide contrast between food and drinks, and audio guides were unknown to be offered or not, according to both employees.
A Review of Ophthalmic Telemedicine for Emergency Department Settings
Published in Seminars in Ophthalmology, 2022
Sofia De Arrigunaga, Kanza Aziz, Alice C Lorch, David S Friedman, Grayson W Armstrong
Another option that can be used in the ED setting is the combination of a smartphone camera with a macro lens. Macro lenses act as magnifying glasses and are easily available for purchase online.31 A macro lens can be combined with practically any smartphone camera. Following a standard slit-lamp setup, a light source can be projected onto the anterior segment and pictures or videos can be obtained from a distance of 3–5 cm from the ocular surface.31 Smartphones combined with a macro lens are comparable in overall clinical utility with those taken with a smartphone alone. Smartphone alone is superior for images of the lens and conjunctiva, whereas the macro lens is superior for images of the anterior chamber, iris and lens.32