| 单词 | convergent strabismus |
| 例句 | Moreover, ophthalmoscopic determination of the error in convergent strabismus is specially difficult, for one cannot advise the patient as to a suitable direction for the eye not under investigation. Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z The opinion is prevalent that convergent strabismus usually begins in the form of periodic squint, and that a permanent deviation is developed in this way only. Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z In many cases it may be so; on the other hand I have sometimes seen convergent strabismus arise suddenly, without a preliminary stage of periodic squint. Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z For near objects the myopic eye is used without accommodation and therefore also without convergent strabismus of the right. Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z If we want to draw a comparison between convergent and divergent squint, we must consider only absolute divergent strabismus, for convergent strabismus does not offer a parallel to relative divergent squint. Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z The fact that these are not so strongly represented in convergent strabismus, as one would have expected according to his theory, had also struck Donders. Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z In convergent strabismus, however, no one, at least no ophthalmologist, thinks of entertaining such fears for the eye used in fixation, and where is the physiological basis of this whole idea to be found? Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z In divergent strabismus this is apparent, but in convergent strabismus the squinting eye governs the field of vision on the side to which it turns. Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z Alternating squint is usually divergent, with short sight on one side, still convergent strabismus may occur under these conditions. Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z To Donders belongs the merit of having pointed out the presence of hypermetropia in about two thirds of all cases of convergent strabismus. Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z Were the increased demand on the accommodation really the cause of convergent strabismus, asthenopia would be far more common than it is among hypermetropic children who do not squint. Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z According to Donders all these furnish a reason why, in existing hypermetropia, binocular fixation should be abandoned and convergent strabismus developed. Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z It cannot be denied that the relation existing between convergent strabismus and hypermetropia may be as Donders represents it; the only question is, whether it really is so. Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z If Donders' theory is right, convergent strabismus must really begin, as soon as double hypermetropia meets with causes which depreciate the value of binocular vision. Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z The theory may be tested then by statistics, which confront the cases of hypermetropia and convergent strabismus with those cases in which hypermetropia meets with Donders' conditions and normal binocular vision still remains. Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z Afterwards, Donders sought to explain the occurrence of convergent strabismus in emmetropia by paresis of accommodation, which must indeed, according to his theory, produce the same result as hypermetropia. Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z The attempt has really been made to attribute the commencement of convergent strabismus to the accommodation even in emmetropia, and offers fresh proof how easily facts are overwhelmed by theories. Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z But, further, if paresis of accommodation really had the significance assigned to it, atropine, which is so frequently used in the ophthalmic treatment of children, would be followed by convergent strabismus. Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z It may, therefore, be useful for our purpose to cite a few cases of periodic convergent strabismus with emmetropia. Schweigger on Squint A Monograph by Dr. C. Schweigger 2011-03-22T02:00:22.370Z |
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