THE INFLUENCE OF INSULIN UPON ACIDOSIS AND LIPAEMIA IN DIABETES

in heterophoria a tendency for the visual axes to depart from parallelism, and the necessary co-ordination is effected by excessive use of the fusion faculty. When the muscles are fatigued this state of suppressed squint may become actual strabismus, and diplopia may he complained of. It is obvious that heterophoria disturbs the co-ordination between accommodation and convergence, and that increased nervous energy is used up in each act of combined vision. In consequence fatigue will develop and cause asthenopia and headache. It is therefore essential that the error shall be corrected. I shall not here go into the details of the examination. We use the Maddox rod and tangent scale for testing the muscle balance at infinity,and the Maddox wing test for measuring the error at reading distance. HyperphGria causes most trouble, but is not common. The most frequent defect is weakness of converging power, and this causes difficulty in reading and needlework. It is corrected by adding prisms base in to the near glasses, and such an addition is greatly appreciated by those who have convergence insufficiency.