Eyesight

“ Better Eyesight, September 1921 A MONTHLY MAGAZINE DEVOTED TO THE PREVENTION AND CURE OF IMPERFECT SIGHT WITHOUT GLASSES
HOW TO IMPROVE THE SIGHT BY MEANS OF THE IMAGINATION: No. 2 In a recent issue directions were given for improving the vision by the aid of the imagination. ”

“ To the majority of persons, the wearing of spectacles for the purpose of disguise or personation, seems a perfectly simple and easy proceeding. But, to a person of normal eyesight, it is nothing of the kind. For, if he wears spectacles suited for long sight he cannot see distinctly through them at all; while, if he wears concave, or near sight, glasses, the effort to see through them produces such strain and fatigue that his eyes become disabled altogether. ”

“ Central Fixation.—When the vision is normal the eye sees one part of everything it looks at best and every other part worse in proportion as it is removed from the point of maximum vision. When the vision is imperfect it is invariably found that the eye is trying to see a considerable part of its field of vision equally well at one time. This is a great strain upon the eye and mind, as anyone whose sight is approximately normal can demonstrate by trying to see an appreciable area all alike at one time. ”

“ How long will it take for my eyes to become young again, if that is possible? G. H. A. 1. The test card is for everybody.
2. Yes, the swing would help you. The normal eye is constantly shifting, and thus an apparent movement of objects regarded is produced. By consciously imitating this unconscious shifting of the normal eye and realizing this apparent movement which it produces, imperfect sight is always improved.
3. You should discard your glasses permanently. They are never a benefit and always an injury to the eyes. ”

“ Mental pictures are formed first with the eyes closed, then with the eyes open, and as the ability to form them with the eyes open increases the vision increases.
In every way possible the fact is impressed upon the patient that he can be cured only by rest; that he must learn to let his eyes alone; that whatever he does to improve his sight must be wrong. ”

“ Now close your eyes and rest them, remembering some color, like black or white, that you can remember perfectly. Keep them closed until they feel rested, or until the feeling of strain has been completely relieved. Now open them and look at the first word or letter of a sentence for a fraction of a second. If you have been able to relax, partially or completely, you will have a flash of improved or clear vision, and the area seen best will be smaller. ”

“ Rest the eyes by closing or palming, and note that the vision is improved, and pain and discomfort relieved; stare at a letter, concentrate upon it, make an effort to see it, and note that it disappears, and that a feeling of discomfort or pain is produced.
Note that a small part of a large object is seen better than the rest of it.
Accustom the eyes to strong light; learn to look at the sun; note that the vision is not lowered but improved, and that the light causes less and less discomfort. ”

“ Unless the eye is exactly focused at the point from which it is being observed, one sees also a dark shadow at the edge of the pupil, and it is the behavior of this shadow when the mirror is moved in various directions which reveals the refractive condition of the eye. ”

“ We answer, by teaching us to associate vision in general, or the abstract condition regulating our visual impressions, with the presence of the small tangible body we call the eye, and vision in particular, or the individual sensations of vision, (i.e. colours,) with the presence of immeasurably larger bodies revealed to us by touch, and tangibly external to the tangible eye. Sight, as we have said, does not inform us that its sensations are situated in the eye: it does not inform us that we have an eye at all. Neither does touch inform us that our visual sensations are located in the eye. ”

“ One word of warning I must give you: if, in fixing your attention on one of those, it slowly glides away out of sight, round the corner as it were, then it is only something in the retina, and the humour of the eyes carries that gradually away; [65] anything that gradually slides out of sight belongs to the physical retina of the eye, and is not outside yourself. But if they dance up and down in every direction, exactly as the dust in a ray of light coming through a shutter, then you may be sure that you are seeing something in the air beyond your ordinary vision. ”

“ The pupil of the eye, through which the rays of light enter, represents the aperture in the window-shutter; and the image, delineated on the retina, is exactly similar to the picture on the wall.
Caroline. You do not mean to say, that we see only the representation of the object, which is painted on the retina, and not the object itself?
Mrs. B. If, by sight, you understand that sense, by which the presence of objects is perceived by the mind, through the means of the eyes, we certainly see only the image of those objects, painted on the retina. ”

“ A prolonged and steady looking at an object or at objects near the eye, though at proper distance, without rest or frequent change of the visual focus, as in long and absorbed novel-reading, intense study, or persistent diligence in needlework.
4. The practice of reading or otherwise using the sight at too short range. This results in part from insufficient light; or from its faulty direction, so that the hand or body throws a shadow on the page; or so that the direct rays fall upon the eye, causing undue contraction of the pupil, while the page is in shadow. ”

“ Of all the senses none is more frequently the seat of such deceptive judgments than that of sight; and in the science of physiological optics a very considerable share of attention is claimed by optical illusions. For the purposes of convenience, we may draw a distinction between these illusions, which are the direct result of certain properties or imperfections of the eye as an optical instrument, and those which arise from obliquities of judgment in interpreting the sensations optically impressed upon the retina of the eye. ”

“ If you travel in darkness, you expand the pupil of your eye, which, in forming a perfect circle, describes a larger surface, and collects the greater part of the luminous rays which are scattered in the atmosphere. When you appear in daylight, your pupil takes an elliptic form, diminishes, and receives only a portion of these rays, an excess of which would injure your retina. My dear Cat, you are a perfect optician!
When you wish to descend a precipice, you calculate the distance of the solid points with astonishing accuracy. ”

“ CHAPTER XIV - IMAGINATION AS AN AID TO VISION
WE see very largely with the mind, and only partly with the eyes. The phenomena of vision depend upon the mind's interpretation of the impression upon the retina. What we see is not that impression, but our own interpretation of it. Our impressions of size, color, form and location can be demonstrated to depend upon the interpretation by the mind of the retinal picture. ”

“ CHAPTER XXII - THE EYE Sight is considered the most important of the sensations. It is the chief means of bringing the body into proper relations with its surroundings and, even more than the sensation of hearing, is an avenue for the reception of ideas. The sense organs for the production of sight are the eyes; the external stimulus is
Light.—Light, like sound, consists of certain vibrating movements, or waves. They differ from sound waves, however, in form, velocity, and in method of origin and transmission. ”

“ EYE-STRAIN.—Eye-strain is commonly due to either astigmatism, nearsightedness, farsightedness, or weakness of the eye muscles. The farsighted eye is one in which parallel rays entering the eye, as from a distance, come to a focus behind the retina. The [Pg 22] retina is the sensitive area for receiving light impressions in the back of the eyeball. Sight is really a brain function; one sees with the brain, since the optic nerve endings in the back of the eye merely carry light impressions to the brain where they are properly interpreted. ”

“ He treats particularly the problem of optics, and physiological optics is the study of perception by means of the sense of sight. We see things in the external world through the medium of light which they direct upon our eyes. The light strikes the retina, and causes a sensation. The sensation brought to the brain by means of the optic nerve becomes the condition of the representation in consciousness of certain objects distributed in space.... ”

“ EXPRESSIONS OF THE EYE.—The mere expression of the eye conveys precise ideas of the existing and predominant states of the mentality and physiology. As long as the constitution remains unimpaired, the eye is clear and bright, but becomes languid and soulless in proportion as the brain has been enfeebled. ”

“ Every eye probably contains muscæ volitantes, so called; these are fibres, granules, etc., floating in the vitreous humor, throwing their shadows on the retina, and appearing in the field of vision as little dark moving spots. They are most easily detected by looking attentively at a broad, bright, blank surface like the sky. Most persons who have not had their attention expressly called to the existence of these figures are apt to notice them for the first time when some ailment befalls their eyes and attracts their attention to the subjective state of these organs. ”

“ Because the field of vision is thereby much extended; the intensity of sight is also increased, the impressions upon the brain being clearer and better defined, just as in a stereoscope the effect of vision is heightened by a double picture; the sense of sight being more constantly exercised than any other sense during our waking moments, one eye is frequently called upon to give rest to the other ”

“ If you will bear in mind the fact that the colors and values that are seen out of the corners of the eyes, are, on account of their very situation, able to affect only a very limited number of the sensitive nerves of the retina, you will understand that the force of their impact must be proportionately less than those which come to the eye from the full centre of vision ”

“ In the case of animals that have eyes that glow, it appears that we look into the eye through the pupil as if the reflection came from the front surface of the retina. In those animals that give a reflection as if from polished metal I gain no impression of looking into the eye. ”

“ IS PRODUCED Sight is a nervous sensation due to the translation by the brain of the effects caused by rays of light being reflected from some object in front of the eye on to the innermost layer of the eye, the retina.
When an object is looked at, rays of light which reach the object from some source of light (such as the sun, a lamp, etc.) fall on the transparent outer part of the eye, the cornea. On account of its curved surface these rays of light are more or less bent inward so as to fall more or less perpendicularly on the forward anterior convex surface of the lens. ”

“ But the eye is set loose in the head, and surrounded with little muscles, things with which we can turn it up, or down, or in any way, just as we wish. You know how long it takes grandfather to fix his telescope; but our eyes are ready, quicker than we think.
“You perceive, my dear, that this beautiful and curious thing, the eye, is very delicate, and easily injured, and if anything destroys our sight, it is a great calamity, and that the eye ought to be carefully protected. ”

“ The seat of vision is generally supposed to be the retina, though some philosophers regard the choroid coat as the sensitive tablet upon which the impression is made. We may trace the phenomena of vision up to this point, but no further. We know that a distinct image is formed upon one or other of the delicate coats of the eye, but the manner in which the sensation is conveyed to the brain is an inscrutable mystery. ”

“ Assuming as proved or evident that the sight cannot inform us of distance in a direct line outwards, inasmuch as all the points in such a line are projected upon a single point in the retina, he argues that all sight involves foresight ; that an apparently simple perception involved an infererence founded upon association, and that the visual sensations are merely signs of of corresponding tactual sensations. ”

“ The physiologists say that light reflected off objects strikes the retina of the eye and the sensation goes through the optic nerve to the brain. The faculty of sight, of seeing, is simply a physical phenomenon. It makes no difference to the eyes what they are focused on, they produce sensations in exactly the same way. ”

“ All those operations, therefore, which proceed from direct irritation of the nervous part of the visual organ, without the medium of the eye and of light, under the term subjective vision, are opposed to those phenomena produced by the media of eye and light, and known as objective vision. ”

“ The sense of vision is excited by the influence of light on the retina, the special terminal organ connected with the optic nerve. By excitation of the retina, a change is induced in the optic nerve fibres, and is conveyed by these to the brain, the result being a luminous perception, or what we call a sensation of light or colour. ”

“ Immediately over the pupil of the eye we find the faculty of Vision or sense of Sight, marked Light, which runs into a sense of Shade at the inner angle of the eye, by which two perceptions everything in nature except colors is recognized. Light extends up into Color. ”

“ If the simple enlargement of a single pupil, such as takes place in us on emerging from a strong into a dim light, makes so great a difference in our power of vision a fact with which we are all familiar on going from a well-lighted room into what seems for the first few seconds complete darkness we may well believe that the permanent means of entry into the sensorium of an immense number of separate rays may give greatly enlarged powers of seeing scantily illuminated objects. ”