See Also: trilobite(dictionary)
trilobite(encyclopedia)
trilobite(dictionary)
trilobite(medicine)
Herbal medicine (botanical medicine, herbology, phytomedicine)(health)
confrontation(dictionary)
confrontation(dictionary)
Confrontation(health)
confrontation(medicine)
confrontation method(medicine)

confrontation method (medicine) and trilobite (sh)


confrontation method (medicine)


confrontation method


A method of perimetry; the examiner compares the visual fields of the patient with his own by facing the patient who has one eye covered and the Other fixed upon the corresponding (confronting) eye of the examiner. The examiner then holds his finger midway between the patient and himself and moves it slowly in different directions until the patient fails to see it. In each instance the finger is moved again toward the original position until it is just seen by the subject.


trilobite (sh)




Any of a group of ovate arthropods (subphylum Trilobita) that came to dominate the seas งใ 540 million years ago and became extinct งใ 245 million years ago.

Trilobites had a chitinous exoskeleton and three body lobes: a raised middle lobe with a lower lobe on each side. The head, thorax, and tail were segmented; each segment bore two appendages. The forwardmost appendages were sense and feeding organs. Most species had two compound eyes, though some were eyeless. Some were predators, others were scavengers, and still others probably ate plankton. Paradoxides harlani, found near Boston, grew to 18 in. (45 cm) long and may have weighed 10 lbs (4.5 kg). Other species were small.


Trilobite

Leslie Jackman
Natural History Photographic Agency