He chose Madrid simply because it was cheerless and bare and of ophthalmic ugliness.
"Castilian Days"
John Hay
The ophthalmic tuberculin is placed in one eye and the other eye is used as a check.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
Sometimes a tuberculous animal that fails to react to those tests shows evidence of the disease upon the application of the ophthalmic test.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler