Using thermography for an obstruction of the lower lacrimal system

Machado, Marco Antônio Cardoso; Silva, João Amaro Ferrari; Brioschi, Marcos Leal; Allemann, Norma

doi:10.5935/0004-2749.20160014

Cited by 6 publications

(1 citation statement)

References 3 publications

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“…Machado et al reported the thermographic findings in a 56-year-old woman with acute chronic dacryocystitis and obstruction of the upper and lower lacrimal points, finding hyporadiation in the area corresponding to dilation of the lacrimal sac of the affected eye, which could be associated with the degree of edema caused by tissue inflammation. In addition, this thermographic dynamic study showed no cooling of the lacrimal sac of the affected eye when applying cold drops, while the temperature decreased on the contralateral side with a healthy, open tear duct [ 38 ].…”

Section: Use Of Thermography In Ophthalmologymentioning

confidence: 99%

Applications of Infrared Thermography in Ophthalmology

Gulías-Cañizo

Rodríguez-Malagón

Botello-González

et al. 2023

Life

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Body temperature is one of the key vital signs for determining a disease’s severity, as it reflects the thermal energy generated by an individual’s metabolism. Since the first study on the relationship between body temperature and diseases by Carl Reinhold August Wunderlich at the end of the 19th century, various forms of thermometers have been developed to measure body temperature. Traditionally, methods for measuring temperature can be invasive, semi-invasive, and non-invasive. In recent years, great technological advances have reduced the cost of thermographic cameras, which allowed extending their use. Thermal cameras capture the infrared radiation of the electromagnetic spectrum and process the images to represent the temperature of the object under study through a range of colors, where each color and its hue indicate a previously established temperature. Currently, cameras have a sensitivity that allows them to detect changes in temperature as small as 0.01 °C. Along with its use in other areas of medicine, thermography has been used at the ocular level for more than 50 years. In healthy subjects, the literature reports that the average corneal temperature ranges from 32.9 to 36 °C. One of the possible sources of variability in normal values is age, and other possible sources of variation are gender and external temperature. In addition to the evaluation of healthy subjects, thermography has been used to evaluate its usefulness in various eye diseases, such as Graves’ orbitopathy, and tear duct obstruction for orbital diseases. The ocular surface is the most studied area. Ocular surface temperature is influenced by multiple conditions, one of the most studied being dry eye; other diseases studied include allergic conjunctivitis and pterygium as well as systemic diseases such as carotid artery stenosis. Among the corneal diseases studied are keratoconus, infectious keratitis, corneal graft rejection, the use of scleral or soft contact lenses, and the response to refractive or cataract surgery. Other diseases where thermographic features have been reported are glaucoma, diabetic retinopathy, age-related macular degeneration, retinal vascular occlusions, intraocular tumors as well as scleritis, and other inflammatory eye diseases.

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Section: Use Of Thermography In Ophthalmologymentioning

confidence: 99%