ter making operandi is as follows : Dr. Sureau has recently presented to the scientific these observations, it only remains to read the dials in A pencil of luminous rays is projected into the eye order to write the prescription for eyeglasses. The world a most ingenious apparatus designed for… … astigmatism, recourse is had and labors of Dr. Underwood. SUREAU’S OPTOMETER SKIASCOPE. to spherical glasses, and it is He was born at Enfield, Mass., very important for the oculist on January 12, 1825. He was buttons of the apparatus are revolved according as to determine the exact position of the…
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