[Foveal cone densitometer and changes in foveal cone pigments with aging].
Nippon Ganka Gakkai Zasshi
; 99(2): 212-9, 1995 Feb.
Article
em Ja
| MEDLINE
| ID: mdl-7701994
ABSTRACT
A foveal cone densitometer was built for measuring the kinetics of foveal cone pigments in human eyes. The light from a 500-W xenon lamp was divided into reference, measuring, and bleaching beams, and projected through an optical fiber leading to a modified fundus camera. After the light was projected into the ocular fundus, the reflected light (central 1 degree) was measured by a photomultiplier and the regeneration time and the two-way density were abstracted from the records. The two-way density, which is the decadic logarithm of the measuring-reference beam ratio under bleached conditions divided by the measuring-reference beam ratio under dark conditions, eliminated the artifacts caused by eye movement of blink. Reliable curves were obtained in 45 eyes out of 53 healthy Japanese subjects (age range, 9 to 82 years). The mean +/- standard deviation SD of the two-way density (log) and the time constant (sec) were 0.34 +/- 0.09 and 139.9 +/- 79.3, respectively. The time constant significantly increased with aging.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Pigmentos da Retina
/
Envelhecimento
/
Células Fotorreceptoras Retinianas Cones
/
Fóvea Central
Limite:
Adolescent
/
Adult
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Aged
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Aged80
/
Child
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
Ja
Revista:
Nippon Ganka Gakkai Zasshi
Ano de publicação:
1995
Tipo de documento:
Article