Arizona republican., 1899-06-02
COFfPLEXiTY OF VISION.
(By Prof. Paul Ramser.)

l.
 Education is made possible to us by
 means of our senses. The knowledge
 of the past generations, the teachings
 Of the present, in fact, all that makes
 up the sum and substance of learning
 is made the property of our minds through the agency of sight and hear ing. While hearing plays very i'm l pOrtant part in the matter of learning,
 it can in no way be compared with
 sight, especially in the education
 that comes with early years. The i'm 1 p0rtance of this sense is recognized by
 all, but very few give much thought ! to the organ of sight, unless attention 1 is called to il from some direct trouble
 with the eye itself.
 | Other organs of the body are made | the subject of anxious solicitude, when i there is no cause for the same, but the | eye rarely ever gets a thought be-
 slowed upon it as long as it does its
 work we'll This is largely due to the perfection of the eye. While it is with cut doubt the most complex organ of the body it still is little inclined to give trouble even when OvertaXed and abused, unless the process is carried too far. That an instrument of such delicate and complicated mechanism should be able to endure so much, must be a matter Of surprise. Delicate an1 complicated instruments of mans con- struction, require the utmost care in use and keeping in order to meet the wants of the pOsSesSor. The eye is not only able to endure all legitimate drafts upon its strength, but will fer a long time endure the most trying ordeals
 If we are called upon to study the of icir pleXity, if nothing more A complete knowledge of it's functions is only acquired by q thorough knowledge of physics, and mathematics, such as only few men like HelmhOltz and Dond- CTS may have possessed.
 When we study it's anatomy we are almost beWildered at first by it's com plications of muscles, nerves, blood and lymph vessels, together with it's diOpteric media, or those structures for the transmission Of light
 PHOTOGRAPHIC INSTRUMENT.
 The eye indeed may be called a pho tOgraphic instrument self adjusting and printing it's own pictures. The eye, however, can only be compared with a camera, in the object sought by each While the camera is taking a single picture, lacking in color and perspect- i've lH6 eye registers npO0 the Draln a thousand photographs, complete in cClcT, form light and shade as well as perspective. Truly then we may con- sider the eye a wonderful instrument, and may well afford to give consider able time to it's study. But while ali this IS true of the normal healthy eye, a very different state of things con- front Us when the eye departs from what may be considered it's normal state. We would expect an organ made up of so many tissues and separ- ate parts to be subject to manifold dis eases and disarrangements, and indeed. we do find their name legion; but only comparatively few eyes are diseased, among the young. The mal- adIes peculiar to the eye usually come later in life, often times the result of their abuse in early years, or the strain due to a faulty construction 1 within the organ itself.
 CARE OF THE EYES.
 This brings us to an important point | regarding the eyes Of school children. | The eye with all it's perfections of con- is still a somewhat faulty | instrument, and noticeably is it so in ! it's refraction
 The ideal eye, what many consider | the normal eye, is so constructed that ! objects at or beyond a distance of !