 | Robert Druitt - 1839 - 456 páginas
...as a too great thickness, density, or convexity, of the lenses and humours of the eye, so that the rays of light are brought to a focus before they reach the retina ; or maybe induced by habits of study, and by looking at minute objects, which, by irritating the eye,... | |
 | Thomas Turner Tate - 1855 - 442 páginas
...the refraction of the light. When the lenses of the eye are too round, or it may be too dense, the rays of light are brought to a focus before they reach the retina ; this takes place with short-sighted people : on the contrary, when the lenses are too flat, or too... | |
 | Thomas Turner Tate - 1856 - 264 páginas
...the double convex lens, e. When the lenses of the eye are too round, or, it may be, too dense, the rays of light are brought to a focus before they reach the retina ; this takes place with short-sighted people : on the contrary, when the lenses are too flat or too... | |
 | Ira Warren - 1859 - 764 páginas
...the optic nerve, or retina, — as at o, Fig. 173, instead of at b, where it should be formed. The rays of light are brought to a focus before they reach the retina. SURGICAL DISEASES. It may be remedied frequently by exercising the eyes in looking at distant objects.... | |
 | Thomas Turner Tate - 1863 - 284 páginas
...to the double convex lens, e. When the lenses of the eye are too round, or it may be, too dense, the rays of light are brought to a focus before they reach the retina ; this takes place with short-sighted people : on the contrary, when the lenses are too flat or too... | |
 | Robert Druitt - 1865 - 910 páginas
...excitement. SECTION XVn. — SHORT AND LONG SIGHT. 1. SHORT SIGHT, or MYOPIA. — In this affection parallel rays of light are brought to a focus before they reach the retina; and this may be caused either by the refracting power of the eye being too great, or its antero-posterior... | |
 | Robert Druitt - 1867 - 730 páginas
...in the refractive power of the eye, or else on an elongation of its axis, so that in either case the rays of light are brought to a focus before they reach the retina. The cornea is often exceedingly convex, and the secretion of aqueous humor abundant ; and the crystalline... | |
 | 1869 - 392 páginas
...dreamed of in your philosophy." — SUAKSFKBE. 126. Wliy are some persons short-sighted ? Because the rays of light are brought to a focus before they reach the retina, and consequently produce an indistinct picture on the retina. This will be more clearly illustrated by... | |
 | Henry Haynes Walton - 1875 - 1254 páginas
...Muscles of the Eye," and in that on " Squint." MYOPIA, OR SHOKT-SIGHTEDKESS. In myopia, distant or parallel rays of light are brought to a focus before they reach the retina, and the image which is formed on the retina is blurred and indistinct. Only divergent rays, that is, rays... | |
 | Richard Dennis Hoblyn - 1878 - 752 páginas
...close, w»//, the eve). Pwopsis propincua. Short-sight; near-sight; an affection of the eye, in which parallel rays of light are brought to a focus before they reach the retina, 41 When the distance at which ordinary type can be easily read ¡3 less than twelve inches, the vision... | |
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The greater part of it is induced while acquiring the art of writing. When the body is still being formed and is unconsolidated, the child is permitted to sit with the chest and back bent forward, and with the eyes close to the paper. Thus the natural... 
