The Eye Its Refraction And Diseases volume 1
The Eye Its Refraction And Diseases volume 1
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In our eReader you can find the full English version of the book. Read The Eye Its Refraction And Diseases volume 1 Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Eye Its Refraction And Diseases volume 1
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(See article upon After-images. ) The Physiological Blind Spot and the Filling Up of It in the Visual Field. The optic nerve entrance is blind; it is even devoid of light perception. As has been seen it lies to the nasal side of the center of the retina about fifteen degrees, and a little above it. The pres- ence of this blind spot (Mariotte's) can be easily demonstrated by the following plan. Upon a card make two dots several inches apart. Take the card in the right hand, and keeping the left ...eye closed look steadily at the left-hand dot as you cause the card to approach the eye. In a certain position according to the distance of the dots apart, the right-hand dot on the card will disappear from view. It will ap- pear again if the card or the eye is moved a little. The image of the dot upon which the eye is fixed falls upon the macula, and that of the other dot falls upon the optic nerve entrance.
Notwithstanding this, we are not conscious of any gap in our vis- ual field. Some of the printed matter, when we are reading, must throw its image upon the blind optic papilla, but no gap is noticed.
What to read after The Eye Its Refraction And Diseases volume 1?
You can find similar books in the "Read Also" column, or choose other free books by Edward Engler Gibbons to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
(See article upon After-images. ) The Physiological Blind Spot and the Filling Up of It in the Visual Field. The optic nerve entrance is blind; it is even devoid of light perception. As has been seen it lies to the nasal side of the center of the retina about fifteen degrees, and a little above it. The pres- ence of this blind spot (Mariotte's) can be easily demonstrated by the following plan. Upon a card make two dots several inches apart. Take the card in the right hand, and keeping the left ...eye closed look steadily at the left-hand dot as you cause the card to approach the eye. In a certain position according to the distance of the dots apart, the right-hand dot on the card will disappear from view. It will ap- pear again if the card or the eye is moved a little. The image of the dot upon which the eye is fixed falls upon the macula, and that of the other dot falls upon the optic nerve entrance.
Notwithstanding this, we are not conscious of any gap in our vis- ual field. Some of the printed matter, when we are reading, must throw its image upon the blind optic papilla, but no gap is noticed.
What to read after The Eye Its Refraction And Diseases volume 1?
You can find similar books in the "Read Also" column, or choose other free books by Edward Engler Gibbons to read onlineMoreLess
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