The Mechanics of Fitting Glasses Giving Complete Information Concerning Fittin
The Mechanics of Fitting Glasses Giving Complete Information Concerning Fittin
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In our eReader you can find the full English version of the book. Read The Mechanics of Fitting Glasses Giving Complete Information Concerning Fittin 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 Mechanics of Fitting Glasses Giving Complete Information Concerning Fittin
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To quickly assess the difficulty of the text, read a short excerpt:
This read- ing will give the true width between the eyes. Of course if you measure from the nasal side of one eye you meas- ure to the temporal side of the other eye and vice versa.
If you measure with both your eyes open your result will vary 2 or 3 millimeters, because you will not be sure which mark is opposite patient's eye. If you measure en- tirely with one eye the error of parallax will enter so much that your readings will always l)e from 2 to 5 milli- meters too narrow.
To prove the ve...racity of the foregoing statements, make two marks about two inches apart on a piece of 22 THE MECHANICS OF FlTTIXCx Cxi, ASSES j)a}»('r; lay the ]);ii)('r on your desk and rc'sting yonr hand on it liold your rule one or two inches above it. First measure the distance with both eyes, then measure it en- tirely with one eye, and then with each eye separately (the zero with the left and the total width with the right eye) and you will find a decided variance in your three readings. By laying the rule Hat on the paper and meas- uring the exact distance you will find your third measure- ment to be correct.
What to read after The Mechanics of Fitting Glasses Giving Complete Information Concerning Fittin?
You can find similar books in the "Read Also" column, or choose other free books by Robert D Robert Deleu Pettet to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
This read- ing will give the true width between the eyes. Of course if you measure from the nasal side of one eye you meas- ure to the temporal side of the other eye and vice versa.
If you measure with both your eyes open your result will vary 2 or 3 millimeters, because you will not be sure which mark is opposite patient's eye. If you measure en- tirely with one eye the error of parallax will enter so much that your readings will always l)e from 2 to 5 milli- meters too narrow.
To prove the ve...racity of the foregoing statements, make two marks about two inches apart on a piece of 22 THE MECHANICS OF FlTTIXCx Cxi, ASSES j)a}»('r; lay the ]);ii)('r on your desk and rc'sting yonr hand on it liold your rule one or two inches above it. First measure the distance with both eyes, then measure it en- tirely with one eye, and then with each eye separately (the zero with the left and the total width with the right eye) and you will find a decided variance in your three readings. By laying the rule Hat on the paper and meas- uring the exact distance you will find your third measure- ment to be correct.
What to read after The Mechanics of Fitting Glasses Giving Complete Information Concerning Fittin?
You can find similar books in the "Read Also" column, or choose other free books by Robert D Robert Deleu Pettet to read onlineMoreLess
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