. A treatise on diseases of the eye . Normal Eye Ground, Average Tint. (Posey and Wright. FIG. 2. Normal Eye Ground, Brunette. (Posey and Wright.) FUNDUS OCULI 133 formed membranes, etc., above tlie level of the .surrounding the latter case the tal)le on a subsecjuent page gives the equivaleut ofdifferences in level, estimating from the emmetropic fundus, expressedin dioptres and millimeters. In examining with the direct method, the vessels at the margin ofthe disk (those nearer the observer) appear to move in the directionopposite to the movement of the observers eye; in examining w
. A treatise on diseases of the eye . Normal Eye Ground, Average Tint. (Posey and Wright. FIG. 2. Normal Eye Ground, Brunette. (Posey and Wright.) FUNDUS OCULI 133 formed membranes, etc., above tlie level of the .surrounding the latter case the tal)le on a subsecjuent page gives the equivaleut ofdifferences in level, estimating from the emmetropic fundus, expressedin dioptres and millimeters. In examining with the direct method, the vessels at the margin ofthe disk (those nearer the observer) appear to move in the directionopposite to the movement of the observers eye; in examining withthe indirect method, the vessels at the margin of the disk appear tomove in the direction opposite to that of the biconvex lens used in theexamination. This phenomenon is due to parallactic displacement (seepage 146). Luminous Ophthalmoscope.—In this instrument a small electriclight, placed in the axis of the handle of the instrument, supplies theillumination. It may be used for all methods of ophthalmoscopy. It isvery useful at the bedside, in examining the eyes of infants, and forcases
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecteyediseases, bookyear
