Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER IV. Stereoscopic Treatment Of Exophoria. Author's Card For Measurement Of Stereoscopic Heterophoria. ? Ampli- Tude Of Fusion. ? Recovery Exercises. Home Exercises. ? The Suppressed Eye. Controlled Reading. Atj- Thor's Device. ? Number Of Cases Treated And Results. Uniform Schedule For Case Reports. Stereoscopic Treatment Of Exophoria. Let us suppose a case of exophoria of 10A distance, adduction subnormal, greater convergence faculty needed. With o. u. +10. in the clips, centered to correspond to patient's pupillary distance, card marked Bj is put in clip, and the patient is asked over which dot he sees the arrow. He will probably answer five or between five and six. If five, 87653 Fig. 9.? B!. To Measure Fusion Convergence. this means that he has selected the number five spot, with which to fuse the arrow spot, therefore 5 cm. is the patient's easiest fusion distance with o. u. +10. Glasses correcting the refractive error should, of course, be worn and if there is much presbyopia, the o. u. +10. should be made enough stronger to correct it. This will slightly increase the prismatic effect of the decentering. Eyes are closed and the two rotary prisms swung into position to give o. u. 5A base out. Patient opens his eyes and again states position of arrow. If over six, the amount of prism which makes six centimeters the easiest fusion distance has been found. If not correct one or two trials will secure it. Should arrow be seen between six and seven, less than o. u. 5A is required; should it be seen between five and six, more than o. u. 5A is needed. As all the cards, except series B, H and I, are 6 cm. between centers, the stereoscope is now approximately suited to this particular patient, and we, therefore, proceed to test hi...
