Zobrazeno 1 - 10
of 27
pro vyhledávání: '"W T, HAM"'
Publikováno v:
Journal of the Franklin Institute. 223:55-76
Autor:
W T, HAM
Publikováno v:
Archives of Ophthalmology. 50:618-643
Publikováno v:
Review of Scientific Instruments. 41:1712-1714
A technique is described whereby the density of diffraction spots on unidimensional x‐ray film is measured by means of a microdensitometer and recorded on a strip chart recorder; simultaneously, the area under the curve is integrated electronically
Publikováno v:
Investigative ophthalmologyvisual science. 17(10)
The photopathology of retinal lesions produced by extended exposure (1000 sec) to low corneal power levels (62 microW) of blue light (441 nm) was investigated by light microscopy in 20 rhesus eyes over an interval ranging from 1 hr to 90 days after e
Publikováno v:
Ophthalmology. 90(8)
Light can cause retinal damage by mechanical, thermal, or photochemical mechanisms. Mechanical and thermal injury require a very intense light exposure, but photochemical injury is caused by a prolonged exposure to light levels that probably would be
Publikováno v:
Health physics. 54(3)
Threshold damage in the macaque retina is shown to be equivalent for the argon-krypton (Ar-Kr) 647 nm and the helium-neon (He-Ne) 632.8-nm lines for exposures to continuous wave (CW) radiation from 1 to 1,000 s. This equivalence allows interpolation
Autor:
M L, Saunders, H F, Young, D P, Becker, R P, Greenberg, P G, Newlon, R L, Corales, W T, Ham, J T, Povlishock
Publikováno v:
Surgical neurology. 14(1)
Lasers generate unidirectional beams of monochromatic, and temporally and spatially coherent electromagnetic radiation that are capable of vaporizing and coagulating biological tissue. Specific physical characteristics of laser energies of different
Publikováno v:
Annals of ophthalmology. 21(10)
Increased oxygen levels decrease the threshold for photochemical retinal damage. We measured arterial oxygen levels in a group of ophthalmic surgical patients. As expected, levels exceeded unanesthetized measurements by one to two times. Based on exp
Autor:
C. L. Crouch, P. C. Hughes, R. Corth, J. W. Griffith, W. T. Ham, R. M. Neer, D. D. Job, D. H. Sliney, J. W. Sausville, A. L. Lewis, F. Daniels, S. K. Guth, E. D. Bickford, D. S. Berger, J. A. Parrish, L. Thorington, W. H. Parr, I. Matelsky
Publikováno v:
Photochemistry and photobiology. 30(2)
Publikováno v:
Investigative ophthalmologyvisual science. 25(8)
Under conditions of nonthermal radiant exposure to blue light (440 nm) the primate retina can suffer photic injury by a mechanism that must be photochemical in nature. We have examined the effects of elevated blood oxygen (pO2 of 270 mmHg) on the ret