Oculo Refractive Cyclopedia And Dictionary
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Generally speaking.
312 OPHTHALMOSCOPY atrophy is either primary, i. E. , due to a disease of the optic nerve itself, or secondary, i. E. , due to strangulation by optic neuritis. In the first type the color is a brilliant pearly white, the edges are sharp-cut and dark, the lamina cribrosa (see Anatomy) very prominent, and the vessels almost normal. In secondary atrophy the color is a dirty greyish-white, the edges indistinct, the lamina not conspicuous and the vessels are narrow and tortuous.
...THE VESSELS.
The retinal vessels, arteries and veins, can be seen entering the eye around the margin of the optic disc, and distributing themselves in a radiating fashion, — principally in a north and south direction from the disc — over the eye-ground. The choroidal vessels can also be seen through the retina dis- tributed over the choroid. The distinguishing points between the retinal and choroidal and retinal vessels are as follows: Choroidal — Retinal — More numerous Not so numerous Larger size Smaller size Close together Separated Nearly parallel Divergent toward periphery Frequently anastomose Do not anastomose Same size along course Diminish in size toward periphery Veins and arteries same \'eins and arteries differ Flat ribbon-like appearance Cylindrical form Considering the retinal vessels alone, we have to distinguish between the arteries and the veins.
What to read after Oculo Refractive Cyclopedia And Dictionary?
You can find similar books in the "Read Also" column, or choose other free books by Thomas George Atkinson to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Generally speaking.
312 OPHTHALMOSCOPY atrophy is either primary, i. E. , due to a disease of the optic nerve itself, or secondary, i. E. , due to strangulation by optic neuritis. In the first type the color is a brilliant pearly white, the edges are sharp-cut and dark, the lamina cribrosa (see Anatomy) very prominent, and the vessels almost normal. In secondary atrophy the color is a dirty greyish-white, the edges indistinct, the lamina not conspicuous and the vessels are narrow and tortuous.
...THE VESSELS.
The retinal vessels, arteries and veins, can be seen entering the eye around the margin of the optic disc, and distributing themselves in a radiating fashion, — principally in a north and south direction from the disc — over the eye-ground. The choroidal vessels can also be seen through the retina dis- tributed over the choroid. The distinguishing points between the retinal and choroidal and retinal vessels are as follows: Choroidal — Retinal — More numerous Not so numerous Larger size Smaller size Close together Separated Nearly parallel Divergent toward periphery Frequently anastomose Do not anastomose Same size along course Diminish in size toward periphery Veins and arteries same \'eins and arteries differ Flat ribbon-like appearance Cylindrical form Considering the retinal vessels alone, we have to distinguish between the arteries and the veins.
What to read after Oculo Refractive Cyclopedia And Dictionary?
You can find similar books in the "Read Also" column, or choose other free books by Thomas George Atkinson to read onlineMoreLess
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