A manual of diseases of the eye / by Charles H. May and Claud Worth.

  • May, Charles Henry, 1861-1943.
Date:
1924
Catalogue details

Licence: Public Domain Mark

Credit: A manual of diseases of the eye / by Charles H. May and Claud Worth. Source: Wellcome Collection.

    392/524 (page 336)
    is the seat of irregular astigmatism the rings will be distorted. This forms a very useful qualitative test. Treatment consists rn prescribing glasses which correct the error. In many cases of moderate or high degree it is im¬ possible to obtain V. E with the full correction ; we may have to be satisfied with ~ or yk. But the vision often improves after the lenses have been worn for a time. The glasses should be worn constantly. When the correction has been estimated with the eye under the effects of a cycloplegic, a slight i eduction may perhaps be necessary in cases of moderate 01 high degrees of astigmatism, but as a rule the full correction RICHT LEFT will be tolerated. The relief which cylinders give is usually very pronounced. The direction of the axis of a cylinder is indicated according to two systems : I. By the angle which the axis makes with the horizontal, the angles being numbered from o degrees on our right side (as we stand before the patient and counting upward) to iSo degrees qn qur left side (Fig. 293)—i.e., cqmmencing at