EYE MOVEMENTS 



499 



TREATMENT OF STRABISMUS. This consists either in the use of suitable 

 prismatic spectacles which will cause a recombination of the double images, or in 

 operative measures. In the latter, either the tendon of the paralysed muscle is short- 

 ened, or that of its antagonist is lengthened, or better still a combination of both 

 methods of treatment. Lastly there is a type of strabismus which is found to accom- 

 pany the refractive errors which cause long and short sight. This type of strabismus, 

 which is called concomitant, is eliminated by correcting the refractive error. (This 

 important subject will be referred to again later on page 537.) 



