A Manual of Clinical Ophthalmology
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In our eReader you can find the full English version of the book. Read A Manual of Clinical Ophthalmology 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 A Manual of Clinical Ophthalmology
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commenced to fail. At sixty, 2 for far, and + 1-50" for near vision. Patient, age forty-five, requiring 8 O 2 C ax. 1 80 for distance, will wear 5 o 2 r ax. 180 for near. Take, as an example, next, simple myopic astig- matism : 2 C ax. 135 = f, in a patient forty-five years old, MYDRIATICS. 75 the presbyopia correction is -J- I o 2 C ax. 135. At the age of fifty, the correction would be -f 2 O 2. C ax. 135 (= + 2 c ax. 45 ).
Presbyopia in mixed astigmatism : age forty-five, I o -f- 3 ax. 90 = f.... Add -\- I- f r near, which would give as the presbyopic correction + 3 ax. 90 (+ I added to i = o) ; at fifty, add + 2 D for near, which would equal -f i o -\~ 3 ax. 90.
In all cases of presbyopia the weakest glass which will serve all the purposes demanded should be ordered, for it must be remembered that the ciliary muscle and internal rectus are supplied by the same nerve, and that a strong glass enforces excessive convergence.
MYDRIATICS.
In estimating total hypermetropia or hypermetropic astigmatism, and especially those of minor degree, it will be necessary to paralyze the accommodation in most persons under forty years of age.
What to read after A Manual of Clinical Ophthalmology?
You can find similar books in the "Read Also" column, or choose other free books by Howard Forde Hansell to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
commenced to fail. At sixty, 2 for far, and + 1-50" for near vision. Patient, age forty-five, requiring 8 O 2 C ax. 1 80 for distance, will wear 5 o 2 r ax. 180 for near. Take, as an example, next, simple myopic astig- matism : 2 C ax. 135 = f, in a patient forty-five years old, MYDRIATICS. 75 the presbyopia correction is -J- I o 2 C ax. 135. At the age of fifty, the correction would be -f 2 O 2. C ax. 135 (= + 2 c ax. 45 ).
Presbyopia in mixed astigmatism : age forty-five, I o -f- 3 ax. 90 = f.... Add -\- I- f r near, which would give as the presbyopic correction + 3 ax. 90 (+ I added to i = o) ; at fifty, add + 2 D for near, which would equal -f i o -\~ 3 ax. 90.
In all cases of presbyopia the weakest glass which will serve all the purposes demanded should be ordered, for it must be remembered that the ciliary muscle and internal rectus are supplied by the same nerve, and that a strong glass enforces excessive convergence.
MYDRIATICS.
In estimating total hypermetropia or hypermetropic astigmatism, and especially those of minor degree, it will be necessary to paralyze the accommodation in most persons under forty years of age.
What to read after A Manual of Clinical Ophthalmology?
You can find similar books in the "Read Also" column, or choose other free books by Howard Forde Hansell to read onlineMoreLess
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