Plange H
Gesnerus. 1990;47 Pt 1:31-43.
The subjective visual phenomena known as "muscae volitantes" ("floating flies") were already known to the Greeks. Galen (2nd c. A.D.) explained them within his theory of vision as circumscript condensations of the aqueous. This opinion prevailed in Arab medicine and even in the science of the Renaissance and later. When, in the 17th c., Galen's theory, according to which the crystalline lens was the organ of visual perception, was replaced by Kepler's insight that the image of the outer world is formed on the retina, scholars such as Dechales and Morgagni came near the truth. In 1823, Purkinĕ identified the muscae as opacities floating in the vitreous.
被称为“飞蚊症”（“漂浮的苍蝇”）的主观视觉现象在希腊人时期就已为人所知。盖伦（公元2世纪）在他的视觉理论中将其解释为房水的局限性浓缩。这一观点在阿拉伯医学甚至文艺复兴及之后的科学中都占主导地位。17世纪，当盖伦认为晶状体是视觉感知器官的理论被开普勒关于外部世界的图像在视网膜上形成的见解所取代时，德沙勒斯和莫尔加尼等学者已接近真相。1823年，浦肯野将飞蚊症确定为漂浮在玻璃体中的混浊物。
