1988 Volume 6 Issue 2 Pages 67-78
MM, who lost her sight binocularly due to keratomalacia 10 months after birth, received optical iridectomy on her right eye at the age of 12. Preoperatively, her right eye had only light perception. Immediately after the operation, her vision improved little, if at all. It was found that she could distinguish more light, but couldn't see either color or form. She had conspicuous nystagmus, and could not fixate continuously on the light projected on a dark screen, and often failed to indicate the direction from where the light had entered her right eye, except when it entered in front of the left side. Prior to facilitating her vision-sign system activity, her activity of touch-sign system was intensively examined. In particular, the extent (roughness or density) of differentiation in various kinds of attribute (length, size, 2-dimensional figure and solid figure) was investigated during a period of about 2 months after the operation.
