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Medical Definition of Centrad
1. 1. Toward the centre. 2. A unit of measurement of the refracting strength of a prism; it corresponds to the deviation of a ray of light, the arc of which is 1/100 of the radius of the circle, or 0.57°. (05 Mar 2000)
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1. 1. Toward the centre. 2. A unit of measurement of the refracting strength of a prism; it corresponds to the deviation of a ray of light, the arc of which is 1/100 of the radius of the circle, or 0.57°. (05 Mar 2000)