n. Any form of blindness that is accompanied to no obvious change to the eye; often the result of disease of the optic nerve
the GNU version of the Collaborative International Dictionary of English
n. 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.
The Century Dictionary and Cyclopedia
n. 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.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. 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."