Text-book of ophthalmology . OBJECTIVE EXAMINATION OF THE EYES 107 lion of the latter. By taking all these factors into consideration we can determine therefraction, provided we ascertain the distance at which the observer has to be in order tosee the image of the flame upon the fundus of the patients eye distinctly. [Cf. § 99.] 96. (3) The determination of the refraction by means of the shadowtest was discovered by Cuignet, who called it keratoscopy. It is also knownas pupilloscopy, retinoscopy, and skiascopy (wid, shadow). In using it, theobserver places himself at a distance of rather more
Text-book of ophthalmology . OBJECTIVE EXAMINATION OF THE EYES 107 lion of the latter. By taking all these factors into consideration we can determine therefraction, provided we ascertain the distance at which the observer has to be in order tosee the image of the flame upon the fundus of the patients eye distinctly. [Cf. § 99.] 96. (3) The determination of the refraction by means of the shadowtest was discovered by Cuignet, who called it keratoscopy. It is also knownas pupilloscopy, retinoscopy, and skiascopy (wid, shadow). In using it, theobserver places himself at a distance of rather more than one metre fromthe patient, and throws light into his pupil by means of a concave the mirror is in a certain position, the whole pupil appears a vividred; then if the mirror is turned a little on its vertical axis, a black shadowappears at the edge of the pupil and, as the mirror is rotated still more,passes over the whole area of the pupil, until the latter is completely the direction in which the
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