The surface temperature of the eye or periorbital skin can be determined by contact or by measuring the quantity of radiation emitted (Mapstone, I968). The latter method is in practice more convenient and accurate, using an instrument such as a bolometer, which records temperature directly on a dial, or an infrared imaging device that produces a thermal picture. The purpose of this paper is to describe the thermographic patterns that occur in normal, ischaemic, and hyperaemic ocular states, using an infrared camera.
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R Mapstone (1970) studied this question.