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Nyctalopia etymologically means night blindness, but the general usage, making the term mean night-vision, is so strongly intrenched that it is useless and confusing to attempt any reinstatement of the old significance. The condition in which one sees better by night, relatively speaking, than by day is due to some lesion of the macular region, rendering it blind.
Exp. 2 1/2 inches. CHELONIA PALLIDA, pl. 5. f. 3. Anterior wings pale brown, with white nervures and nervules, and marked with several whitish spots, of which four are on the costa, two longitudinal before, two transverse beyond the middle of the wing, and on the inner margin are three irregular patches, sometimes confluent, beyond which is a band parallel with the outer margin, commencing above the upper median nervule, and terminating on the inner margin; posterior wings white, with a discoidal spot, a macular band near the outer margin, and a less distinct marginal one, all brownish; head white; thorax white, with three black vittae; abdomen above rufous, with six transverse black spots, the sides varied with black and white; antennae black; femora red; tibiae and tarsi black.
Affections of the Skin are among the most constant manifestations. An evanescent macular rash, not unlike that of measles roseola is the first to appear, usually in from six to eight weeks from the date of infection; it is widely diffused over the trunk, and the original dull rose-colour soon fades, leaving brownish stains, which in time disappear.
A patient, then aged 21, suffered three years ago from a scotoma almost central; and was first seen six months after that with a macular choroidal atrophy and abnormal pigmentation. She suffered, we afterwards concluded, from choroidal tuberculosis. A recurrence involving adjoining choroid occurred fourteen months ago.
Posey had a case of coloboma in the macular region in a patient who had a supernumerary tooth. He believes the defects were inherited, as the patient's mother also had a supernumerary tooth. Nunnely reports cases of congenital malformation in three children of one family. The elder sister had the same congenital condition, but to a lesser degree.
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