From 1959 to 1962 the author operated 204 eyes of leprosy patients (chiefly secondary cataract) in 3 leprosaria in Japan. An observation was kept on the operated eyes for three years and a half past and the results were obtained, as fallows:
1. 82% of the operated eyes were improved in their visual acuity.
2. 35% of 130 eyes which were improved, aggravated again within three years and a half.
3. Main causes of aggravation were Opatitas Cornae due to Lagophthalmos, Occculusio Pupillae by Uveitis, Glancoma, Hyphaema and Chorioretinitis.
4. An intimate relationship was found between aggravation of leprosy and visual acuity. That is; many of those who aggravated in the ducai condition lowered their visual acuity.
5. Such followings seemed to be the possible hindrances of improving visual acuity as outflow of vitreous-body, over-iridectomy, remains of Nucleus, Cortex, Capsula lentis, imcomplete suture of the wound, Hyphaema, Abcessus corporis vitrei, Luxatio lentis and explosive bleeding.
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