[Read in the Section on Ophthalmology, Otology, and Laryngology.]
In the application of glasses for the relief of ametropia and presbyopia we often have need of two pair of spectacles or glasses—one for near and another for distant vision.
It is inconvenient for the wearer to apply and remove move each pair in remote and proximal vision. Again, the use of bifocal glasses is attended with the constant and often annoying influence of such lenses upon the eyes, incident to the rapid variation in the accommodation. Moreover, although it may be effected, it is too expensive to be desirable. We cannot not ordinarily adapt glasses for astigmatism in the upper and lower lenses in bifocals.
We desire, then, to adopt some plan which will avoid at least some of these defects.
The first object, then, is to obviate the unpleasant effects of nose-pieces in those who are able to wear