noun.
Total loss of vision, especially when occurring without pathological changes to the eye.
The Century Dictionary and Cyclopedia
noun.
A partial or total loss of sight independent of any discoverable lesion in the eye itself: formerly and still sometimes called gutta, serena; by Milton “a drop serene,” P. L., iii. 25.
the GNU version of the Collaborative International Dictionary of English
noun.
A loss or decay of sight, from loss of power in the optic nerve, without any perceptible external change in the eye; -- called also gutta serena, the “drop serene” of Milton.
noun.
Any form of blindness that is accompanied to no obvious change to the eye; often the result of disease of the optic nerve
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
partial or total loss of sight without pathology of the eye; caused by disease of optic nerve or retina or brain
Word Usage
"So, too, I said I would treat a negative disease, such as amaurosis or torpidity of liver, with the negative pole, placing the positive pole on either some healthy or morbidly positive part."