A covariance structure analysis of flicker sensitivity.
Vision Res
; 35(11): 1575-83, 1995 Jun.
Article
em En
| MEDLINE
| ID: mdl-7667915
ABSTRACT
We tested whether linear structural models of the mechanisms underlying flicker sensitivity could reproduce the variance-covariance matrix of temporal contrast sensitivity data. Monocular sensitivities to frequencies between 2.5 and 45 Hz were measured for 124 subjects, ages 18-88 yr. Exploratory factor analyses revealed that both a two-mechanism and a three-mechanism model could adequately account for the data. Furthermore, confirmatory factor analyses and full structural equation models, using age as an explanatory variable, supported both models, with the three-factor model giving a somewhat better representation of the data. Parsimony favors the two-mechanism model. But patterns of loss associated with pre-exudative age-related maculopathy are more easily understood in terms of three underlying mechanisms.
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Base de dados:
MEDLINE
Assunto principal:
Envelhecimento
/
Sensibilidades de Contraste
/
Fusão Flicker
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
Limite:
Adolescent
/
Adult
/
Aged
/
Aged80
/
Humans
/
Middle aged
Idioma:
En
Revista:
Vision Res
Ano de publicação:
1995
Tipo de documento:
Article
País de afiliação:
Estados Unidos