Author: Donald G. Pitts
Publisher:
ISBN:
Category : Physiological optics
Languages : en
Pages : 28
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"A method is presented in which a Beckman model B spectrophotometer is used for the measurement of the transmittance of the visible spectrum through the bovine eye media. The procedures used for the various media show that the largest amount of the visible spectrum is absorbed by the lens. Increasingly smaller amounts of spectral absorption occurred in the cornea, the vitreous, and the aqueous. A comparison of the calculated component media transmittance with the total eye transmittance reveals less than 2 percent difference. The difference is attributed to the additional backscattering of the various components. Bovine media transmittance data and the rabbit transmittance data of Kinsey show a remarkable likeness, the differences being attributed to globe size."--Abstract
Author: Donald G. Pitts
Publisher:
ISBN:
Category : Physiological optics
Languages : en
Pages : 0
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"A method is presented in which a Beckman model B spectrophotometer is used for the measurement of the transmittance of the visible spectrum through the bovine eye media. The procedures used for the various media show that the largest amount of the visible spectrum is absorbed by the lens. Increasingly smaller amounts of spectral absorption occurred in the cornea, the vitreous, and the aqueous. A comparison of the calculated component media transmittance with the total eye transmittance reveals less than 2 percent difference. The difference is attributed to the additional backscattering of the various components. Bovine media transmittance data and the rabbit transmittance data of Kinsey show a remarkable likeness, the differences being attributed to globe size."--Abstract
Author: Donald G. Pitts
Publisher:
ISBN:
Category : Eye
Languages : en
Pages : 126
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Author: Edward A. Boettner
Publisher:
ISBN:
Category : Infrared radiation
Languages : en
Pages : 60
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The spectral transmittance of ultraviolet, visible, and near infrared light through the ocular media of humans has been measured. Using freshly enucleated eyes, the transmittances of each component part (cornea, aqueous humor, lens, vitreous humor) were determined for the wavelength range from 0.22 to 2.8 microns. To date 9 eyes have been measured, ranging in age from 4 weeks to 75 years. Two types of measurements were made: the first to measure the total light transmitted (direct and scattered) at each wavelength and the second to measure the percent transmittance of that light passing directly through the various media without absorption or scattering. The results show that: (a) the transmission of ultraviolet radiation decreases with the age of the eye; (b) the transmission of infrared radiation appears to be independent of the age; and (c) the maximum total transmittance of the whole eye, about 81 percent, is obtained in the region from 600 to 850 millimicrons.
Author: Donald G. Pitts
Publisher:
ISBN:
Category : Eye
Languages : en
Pages : 126
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Author: Edward A. Boettner
Publisher:
ISBN:
Category : Infrared radiation
Languages : en
Pages : 0
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Book Description
The spectral transmittance of ultraviolet, visible, and near infrared light through the ocular media of humans has been measured. Using freshly enucleated eyes, the transmittances of each component part (cornea, aqueous humor, lens, vitreous humor) were determined for the wavelength range from 0.22 to 2.8 microns. To date 9 eyes have been measured, ranging in age from 4 weeks to 75 years. Two types of measurements were made: the first to measure the total light transmitted (direct and scattered) at each wavelength and the second to measure the percent transmittance of that light passing directly through the various media without absorption or scattering. The results show that: (a) the transmission of ultraviolet radiation decreases with the age of the eye; (b) the transmission of infrared radiation appears to be independent of the age; and (c) the maximum total transmittance of the whole eye, about 81 percent, is obtained in the region from 600 to 850 millimicrons.
Author: Defense Documentation Center (U.S.)
Publisher:
ISBN:
Category : Military art and science
Languages : en
Pages : 1746
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 46
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The spectral transmittance of ultraviolet, visible, and near infrared light through the eye of humans and monkeys was measured. Using freshly enucleated eyes, the transmittances of each component part (cornea, aqueous humor, lens, vitreous humor, retina and choroid) were determined for the wavelength range from 0.22 to 2.8 microns. Two types of measurements were made: the first to measure the total light transmitted (direct and scattered) at each wavelength and the second to measure the percent transmittance of that light passing directly through the various media without absorption or scattering. The results show that: (a) the transmission of ultraviolet radiation decreases with the age of the eye; (b) the transmission of infrared radiation appears to be independent of the age; and (c) the maximum total transmittance of the whole eye, about 83%, is obtained in the region from 600 to 850 millimicrons. The spectral reflectance of the fundus and sclera of the rhesus monkey was measured, with the former reflecting less than 2% in the visible but increasing to 20% in the infrared (1200 millimicrons). The sclera reflects 20 to 30% through the visible and infrared out to 1200 millimicrons. The forward scattered light outside of 1 degree as measured on the whole human eye was 35% plus or minus 5% at 566 and 666 millimicrons.
Author: Indiana University. Optometry Library
Publisher:
ISBN:
Category : Vision
Languages : en
Pages : 422
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Author:
Publisher:
ISBN:
Category : Ophthalmology
Languages : en
Pages : 748
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