We describe ten cases of endocapsular hematoma that developed in the early postoperative period after cataract or combined glaucoma and cataract surgery. After capsulorhexis and phacoemulsification, one of three types of posterior chamber lenses with biconvex optics was implanted in nine eyes. In one eye, a convex-plano poly(methyl methacrylate) lens was implanted. All lenses were implanted in the bag. Postoperatively, an anterior chamber hyphema was observed in four eyes and erythrocytes in another five. Subsequently observed endocapsular hematomas disappeared gradually over the next several months. A narrow space was visible between the posterior optic surface and the posterior chamber in all eyes with a biconvex lens. We believe that blood from the hematoma seeped behind the anterior capsular leaf into that space. A YAG capsulotomy was not necessary in any case.