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The physiologists and the psychologists have studied this play of colors. "Ocular spectra," "colored spots," "phosphenes," such are the names that they have given to the phenomenon. They explain it either by the slight modifications which occur ceaselessly in the retinal circulation, or by the pressure that the closed lid exerts upon the eyeball, causing a mechanical excitation of the optic nerve.
"There are a few formalities which our guests have to go through." "Such as?" "Such as fingerprint and retinal patterns," said Lieutenant Nariaki. Mike cast his eyes to Heaven in silent appeal, then looked back at the lieutenant. "Lieutenant, what is going on here? There hasn't been a security officer in the Space Service for thirty years or more. What am I suspected of?
As you tickle a man's face with a feather, and he laughs, so when you tickle his intellectual principle with a retinal feeling, say, and a muscular feeling at once, it laughs responsively by its category of 'space, but it would be false to treat the space as simply made of those simpler feelings.
Those that cause obstruction of the filtration angle by advancement of the iris and lens, as occurs when the volume of the contents of the vitreous chamber is increased, as from retinal or chorioidal hemorrhage or neoplasm. The various changes are so numerous that they need not be described further here. The ultimate changes due to high tension resemble those already described. Dr.
The appreciation of the distance of an event in time does not, however, wholly depend on the character of this movement of imagination. Just as the apparent distance of a visible object depends inter alia on the distinctness of the retinal impression, so the apparent temporal remoteness of a past event depends in part on the degree of intensity and clearness of the mnemonic image.
According to Mueller, who has adopted this hypothesis, what we perceive is our own retina under the category of space, and the size of the retinal image is the original unit of measurement applied by us to exterior objects. The Spaniard like a child, will have to amplify his retinal image, if he is ever to amount to anything. He will have to amplify it, and, no doubt, complicate it also.
Spinoza and Jean Paul Richter both experienced this survival of dream-images. Still more pertinent is the fact that the effects of retinal fatigue are producible by dream-images. The physiologist Gruithuisen had a dream, in which the principal feature was a violet flame, and which left behind it, after waking, for an appreciable duration, a complementary image of a yellow spot.
In the Annual of the Universal Medical Sciences, 1888, there is a report of seven cases of retinal injury with central scotoma, amblyopia, etc., in Japanese medical students, caused by observation of the sun in eclipse. In discussing the question of electric-light injuries of the eyes Gould reviews the literature of the subject and epitomizes the cases reported up to that time. They numbered 23.
The eye of the Pecten presents a retina, a cornea, a lens of cellular structure like our own. There is even that peculiar inversion of retinal elements which is not met with, in general, in the retina of the invertebrates.
His idea seems to be that Davidson, stooping between the poles of the big electro-magnet, had some extraordinary twist given to his retinal elements through the sudden change in the field of force due to the lightning. He thinks, as a consequence of this, that it may be possible to live visually in one part of the world, while one lives bodily in another.
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