Hereditary myopia in identical twins.

They have been classed as identical twins because of their close resemblance both physically and mentally. Rose and May are an intelligent and cheerful pair of elderly women, indistinguishable to a stranger. They have often had the same illnesses at the same time, they object to being parted, and they tend to answer questions in unison. They went to school at about the age of five, always had to sit close to the blackboard, and were not allowed to do needlework. At about that time they were first examined and found to be myopic. They had measles together at the age of seven. Shortly after that, both started to wear glasses, and still do so. Certain characteristics were examined in detail, with the following results