Text-book of ophthalmology . y cysticercus bladder withits lighter colored margin (Fig. 261). The detached retina is not tremulous, but spon-taneous movements may be made out through it taking place in the bladder. [Otherentozoa, found very rarely in the retina, are the echinococcus, filaria, and larvae ofdiptera (Leber).—D.] 592 TEXT-BOOK OF OPHTHALMOLOGY 531. Symptoms.—The subjective symptoms of detachment of theretina consist in the disturbance of vision that it causes. This is character-ized above all by a limitation of the field of vision, which is often perceivedas a positive phenomenon
Text-book of ophthalmology . y cysticercus bladder withits lighter colored margin (Fig. 261). The detached retina is not tremulous, but spon-taneous movements may be made out through it taking place in the bladder. [Otherentozoa, found very rarely in the retina, are the echinococcus, filaria, and larvae ofdiptera (Leber).—D.] 592 TEXT-BOOK OF OPHTHALMOLOGY 531. Symptoms.—The subjective symptoms of detachment of theretina consist in the disturbance of vision that it causes. This is character-ized above all by a limitation of the field of vision, which is often perceivedas a positive phenomenon by the patient. A dark cloud lies over a part ofthe field of vision, corresponding in location to the detached portion of theretina, which has partially or entirely lost its sensitiveness to light. If, asis so frequently the case, the detachment lies below, the patient complainsof a dark curtain which veils from him the upper part of objects. Forinstance, he does not see the head of a man standing in front of him. Hence,. Fig. 261.—Cysticercus Subretinalis in a Woman Twenty-six Years of Age, who had noticeda Sudden Diminution in her Sight Two Months papilla is encompassed on its outer and lower side by an irregular crescent. The region ofthe posterior pole of the eye is occupied by a bladder-like detachment of the retina. This detachmentbaa B faint-gray hue, and allows the red of the fundus to appear through it, although dully. The edgeof the bladder shows a light-gray, silky luster, while in the center of the bladder a bright yellowish-white speck is visible, which corresponds to the animals head. The retinal vessels run up upon thebladder without showing any marked bend as they pass its edges. The bladder displays active spon-taneous movements, in which the central white speck changes its position, shape, and size. Betweenthe papilla and the inner edge of the bladder is an irregular, light-colored speck in the retina lyingbeneath a small retinal Vessel. The
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