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Relationship between Ocular Surface Temperature and Peripheral Vasoconstriction

机译：眼表面温度与外周血管收缩的关系

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The aim of the present study is to verify whether a peripheral vasoconstriction is related to a change of the eye blood perfusion. This feature is indirectly evaluated measuring the variations of the ocular surface temperature (OST) by infrared thermography. For the experimental tests 45 healthy young subjects (mean age 25.4± 4.1 years) were enrolled, 35 men and 10 women. The test is repeated two times for each subject, with a 30 minutes spacing. Each acquisition is 40 s long, during which the subject immerses the hands in a tank with ice and water (1.6°±0.4°). In a single test the OST is registered during the first 10 s and during the last 10 s. Between the two registrations the subject maintains the eyes closed. So, the OST acquired at the beginning and at the end of the test were compared by a paired T-test The data show a significantly OST increase (p<0.05), especially in the ocular surface areas near to principal sclera arteries, i.e. temporal and nasal areas (average increasing +0.13°): so, there is a response of the eye blood flow to the peripheral vasoconstriction (if the temperature increases we assert that also the flow blood increase). In fact, the organism in hypothermic conditions limits the heat dissipation and so, the blood flow in the areas more exposed to the external environment decreases. Consequently the blood flow increases in districts that guarantee the survival of the subject. The eye, which is perfused by the same vessel networks that lead blood to the central nervous system undergo to an increment of blood flow. Then, the comprehension of relationships between vasoconstriction and eye perfusion in healthy may be important in the study of some ocular pathologies in which the vasoconstriction is an important factor in their etiopathogenesis.
机译：本研究的目的是验证外周血管收缩是否与眼睛血液灌注的变化有关。间接评估该特征通过红外热成像测量眼睛表面温度（OST）的变化。对于实验试验，45个健康的年轻受试者（平均年龄为25.4±4.1岁），参加了35名男子和10名女性。每个受试者重复测试两次，间距为30分钟。每次收购都是40秒，在此期间，受试者浸入冰水和水中的罐中的手（1.6°±0.4°）。在一次测试中，在前10秒和最后10秒期间登记OST。在两个注册之间，主题保持闭眼。因此，在测试开始和结束时获得的OST通过配对的T检验进行比较数据显示，数据显示出显着的变量（P <0.05），特别是在靠近主巩膜动脉的眼表面区域，即时间和鼻区域（平均增加+ 0.13°）：因此，眼血流向外周血管收缩的响应（如果温度升高，我们也会增加流量血液增加）。事实上，体温过低的生物体限制了散热等，所以暴露于外部环境的区域中的血流降低。因此，血流量在保证受试者存活的地区增加。眼睛灌注与相同的血管网络灌注，使血液导致中枢神经系统经历血流的增量。然后，在对健康中的血管收缩和眼睛灌注之间的关系的理解在研究某些眼部病理学中可能是重要的，其中血管收缩是其病因发生的重要因素。

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