Hypochondriacs frequently see dark objects, such as threads, hair, spiders, flies, wasps. These appearences also exhibit themselves in the incipient hard cataract. Many see semi-transparent small tubes, forms like wings of insects, bubbles of water of various size, which fall slowly down, if the eye is raised: sometimes these congregate together so as to resemble the spawn of frogs; sometimes they appear as complete spheres, sometimes in the form of lenses.
Theory of Colours - Goethe, #119
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