. Surgery, its principles and practice . d open method,with which I have had no experience, but the safety of which I doubt,in spite of its distinguished advocates. At the expiration of six weeks to two months, cataract glasses may beadjusted. The correcting lens for distant vision is usually about 11 reading and similar occupations a lens having a focal distance of 25to 33 cm. must be added to the distance glass. If the eye has been hyper-opic prior to the operation, a stronger lens than the one indicated may berequired, while if it has been myopic a weaker one; indeed, it is possibleto
. Surgery, its principles and practice . d open method,with which I have had no experience, but the safety of which I doubt,in spite of its distinguished advocates. At the expiration of six weeks to two months, cataract glasses may beadjusted. The correcting lens for distant vision is usually about 11 reading and similar occupations a lens having a focal distance of 25to 33 cm. must be added to the distance glass. If the eye has been hyper-opic prior to the operation, a stronger lens than the one indicated may berequired, while if it has been myopic a weaker one; indeed, it is possibleto produce by the operation emmetropia, if the former near-sightednesshas been of such degree that the removal of the lens exactly neutralizesit. Usually, and especially during the earlier months after cataractextraction, there is a good deal of astigmatism, but in a technically correctoperation usually not more than l^ or 2 D. remain permanently. This,however, should be corrected and the cjdindric glass incorporated withthe spheric Fig. 459.—Rings Ocular Mask. 870 SURGERY OF THE EYE. Accidents During Operation and Anomalies in the Healing Pro-cess.—If during the passage of the knife across the anterior chamberthe iris should fall in front of it, the incision should be completed in themanner already described, with the result that an irregular colobomawill be cut, which later may be remedied by seizing its jagged edgeswith the iris forceps and trimming them with scissors. Occasionally, especially if a conjunctival flap is made, or during theperformance of iridectomy, there is free hemorrhage into the anteriorchamber, obscuring the field of operation. Usually the blood willcease to flow on the exertion of slight pressure, and by gently strokingthe lower portion of the cornea it may be expelled from the anteriorchamber. If this maneuver fails, the cystotome must be introduced inthe ordinary manner, the capsule lacerated, and the lens delivered,which in the process of its
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