The method may be particularly useful during epidemic when it is necessary to assess promptly the state of health of the people coming from infected regions, this being done directly at railway stations or airports.
The eyes are not only a mirror of a soul, but also a medical record and their thermal radiation can indicate a disease even before clinical signs appear, say Russian scientists under guidance of G.R. Ivanitsky, Corresponding Member of the Russian Academy of Sciences.
They suggest to use cameras recording infrared radiation of people, which would allow to take temperature promptly at a distance. Infrared cameras determine the temperature with precision of up to several hundredth of a degree. During mass diagnostics, it is most convenient to take the temperature of face - a constantly open part of the body. The warmest part of the face is the eye. The eye glow more intensely than the skin in the infra-red range, as they contain six hard-working muscles each, a ramified blood supply system and lachrymal glands.
To get a thermal portrait of the healthy person's eyes, the researchers examined 20 relatively healthy persons at the age of 20 through 65. After the eye is opened, the temperature first drops by approximately 1°C, then it grows up, and then it decreases evenly to reach the final stationary value. When adaptation capabilities of the eye's blood vessels are decreased, it takes twice as long for the temperature to settle down. The researchers have also identified that the eyelid's temperature in the area of the bridge of nose is the highest and it can be used as a remote diagnostic criterion.
The Russian biophysicists are convinced that this thermal portrait of an eye would change in case of a disease. However, symptoms of a disease become noticeable when the disease has already gone too far. But, recording of small temperature deviations in the infra-red range would facilitate finding criteria for early diagnostics of a disease.
MEDICA.de; Source: Russian Academy of Sciences Pushchno