Noted

Two passages in Memento Mori (1959), by Muriel Spark:

The thought crossed his mind, among other thoughts, that Jean's brain might be undergoing a softening process. He looked carefully at her eyes and saw the grey ring round the edge of the cornea, the arcus senilis. Nevertheless, it surrounded the main thing, a continuing intelligence among the ruins. (p. 63)

These thoughts overwhelmed Mrs. Pettigrew with that sense of having done a foolish thing against one's interests, which in some people stands for guilt. (pp. 79-80)