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FRANCIS A. L'ESPERANCE, JR., MD

Arch Ophthalmol. 1966;75(1):61-67.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

Photocoagulation of the choroid and retina can be produced by the absorption of light energy from either the xenon-arc or the laser photocoagulator. Both coagulator systems deliver light energy in the visible or infrared region of the spectrum, and the ultimate chorioretinal effect is determined by the total amount of light energy absorbed and converted to heat. The major physical difference between the light and laser systems is the type of radiation developed by each method.

The ruby laser beam delivers light energy at one wavelength (6943 A) in the deep red region of the visible spectrum. The effect on an ocular tissue is determined by the specific tissue absorption for that wavelength only and by the instantaneous (0.0005 seconds) intensity of the beam. The xenonarc high pressure bulb delivers radiation from all portions of the visible and near infrared spectrum (Fig). This broad spectral energy output is presented to . . . [Full Text PDF of this Article]

Author Affiliations
New York

From the Institute of Ophthalmology, Columbia-Presbyterian Medical Center, 635 W 165th St, New York.

Footnotes
Submitted for publication June 2, 1965.

Reprint requests to 1 E 71st St, New York 10021.

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