 | Giles Christopher Savage - 1902 - 616 pages
...distance of different persons. For the accommodation of those who, on account of presbyopia, myopia, or any high degree of refractive error, cannot see at...clips in which refracting glasses may be placed. The sight openings being very small and exactly in the same horizontal plane, there can be no doubt as... | |
 | George Thomas Stevens - 1906 - 522 pages
...distance of different persons. For the accommodation of those who, on account of presbyopia, myopia, or any high degree of refractive error, cannot see at...clips in which refracting glasses may be placed. The sight openings being very small and exactly in the same horizontal plane, there can be no doubt as... | |
 | George Thomas Stevens - 1906 - 522 pages
...distance of different persons. For the accommodation of those who, on account of presbyopia, myopia, or any high degree of refractive error, cannot see at...clips in which refracting glasses may be placed. The sight openings being very small and exactly in the same horizontal plane, there can be no doubt as... | |
 | 1901 - 1234 pages
...important not to disarrange the working objectives. 27-1 STEVENS: NORMAL DECLINATIONS OF RETINAL MERIDIANS. cannot see at the distance of the test objects from...clips in which refracting glasses may be placed. The sight openings being very small and exactly in the same horizontal plane, there can be no doubt as... | |
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... pointer attached to each tube indicates on a scale the extent to which the tube is rotated. The small sight openings are so adjustable that the distance between them may be suited to the interpupillary distance of different persons. For the accommodation... 