An American Text-Book of Physiology
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In our eReader you can find the full English version of the book. Read An American Text-Book of Physiology 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 An American Text-Book of Physiology
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This condition is fulfilled by means of instruments known as ophthalmoscopes. The principles involved in the construction of the most common form of ophthalmoscope are illustrated diagrammatically in Figure 143.
Fig, 143.— Diagram to illustrate the principles of a simple ophthalmoscope (after Poster).
The rays from a source of light L, after being brought to a focus at a by the concave perforated mirror II M, pass on and are rendered parallel by the lens I. Then, entering the observed eye B, th...ey are brought to a focus on the retina at a'. Any rays which are reflected back from the part of the retina thus illuminated will follow the course of the entering rays and be brought to a focus at a. The eye of an observer at A, looking through the hole in the mirror, will therefore see at a an inverted image of the retina, the observation of which may be facilitated by a convex lens placed immediately in front of the observer's eye.
' Schirmer : Anhivfiir Ophilialmologie, xi. 5.
THE SENSE OF VISION.
What to read after An American Text-Book of Physiology?
You can find similar books in the "Read Also" column, or choose other free books by William H William Henry Powell to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
This condition is fulfilled by means of instruments known as ophthalmoscopes. The principles involved in the construction of the most common form of ophthalmoscope are illustrated diagrammatically in Figure 143.
Fig, 143.— Diagram to illustrate the principles of a simple ophthalmoscope (after Poster).
The rays from a source of light L, after being brought to a focus at a by the concave perforated mirror II M, pass on and are rendered parallel by the lens I. Then, entering the observed eye B, th...ey are brought to a focus on the retina at a'. Any rays which are reflected back from the part of the retina thus illuminated will follow the course of the entering rays and be brought to a focus at a. The eye of an observer at A, looking through the hole in the mirror, will therefore see at a an inverted image of the retina, the observation of which may be facilitated by a convex lens placed immediately in front of the observer's eye.
' Schirmer : Anhivfiir Ophilialmologie, xi. 5.
THE SENSE OF VISION.
What to read after An American Text-Book of Physiology?
You can find similar books in the "Read Also" column, or choose other free books by William H William Henry Powell to read onlineMoreLess
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