Graefe's knife

(gra'feh) [Albrecht von Graefe, German ophthalmologist, 1828-1870.] A narrow bladed knife used in making a section of the cornea. G.'s sign, G.'s symptom. G.'s spots, small areas over the vertebras or near the supraorbital foramen, pre ure upon which causes relaxation of blepharofacial spasiji. G.'s symptom, in exophthalmic goiter the upper eyelid does not follow promptly and evenly the movement of the eyeball downward, but halts or moves jerkily, G.'s test for hetero pho ria, a prism of 10° is held base up or down before one eye; this produces two images of the object looked at in orthophoria one image is directly above the other, in lateral hetero pho ria there is also a lateral displacement of one image. pseudo-G. sign, tardy descent of the upper lid as one looks down and hasty ascent when the gaze is directed upward, occurring in other conditions than exophthalmic goiter.